diff --git a/dict2css/__init__.py b/dict2css/__init__.py
index 3ad1289..13c3918 100644
--- a/dict2css/__init__.py
+++ b/dict2css/__init__.py
@@ -3,9 +3,6 @@
 #  __init__.py
 """
 A μ-library for constructing cascasing style sheets from Python dictionaries.
-
-.. latex:vspace:: 10px
-.. seealso:: `css-parser <https://github.com/ebook-utils/css-parser>`_, which this library builds upon.
 """
 #
 #  Copyright © 2020-2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
@@ -31,25 +28,21 @@
 
 # stdlib
 from io import TextIOBase
-from typing import IO, Any, Dict, Mapping, MutableMapping, Sequence, Union, cast
+from typing import IO, Any, Dict, Iterable, List, Mapping, MutableMapping, Optional, Sequence, Union
 
 # 3rd party
+import tinycss2  # type: ignore[import-untyped]
+import tinycss2.ast  # type: ignore[import-untyped]
 from domdf_python_tools.paths import PathPlus
 from domdf_python_tools.typing import PathLike
 from domdf_python_tools.words import TAB
 
-try:
-	# 3rd party
-	import css_parser  # type: ignore
-except ImportError:  # pragma: no cover
-	import cssutils as css_parser  # type: ignore
-
 # this package
 from dict2css.helpers import em, px, rem  # noqa: F401
 from dict2css.serializer import CSSSerializer
 
 __author__: str = "Dominic Davis-Foster"
-__copyright__: str = "2020-2021 Dominic Davis-Foster"
+__copyright__: str = "2020-2026 Dominic Davis-Foster"
 __license__: str = "MIT License"
 __version__: str = "0.4.0"
 __email__: str = "dominic@davis-foster.co.uk"
@@ -61,10 +54,10 @@
 		"dump",
 		"loads",
 		"load",
-		"StyleSheet",
-		"make_style",
 		]
 
+# TODO: allow int indent like json.dumps etc.
+
 IMPORTANT = "important"
 """
 The string ``'important'``.
@@ -73,11 +66,11 @@
 """
 
 # Property = Union[Tuple[Union[str, int, None], str], str, int, None]
-Property = Union[Sequence, str, int, None]
+Property = Union[Sequence, str, int, float, None]
 
 Style = Mapping[str, Property]
 """
-Type annotation representing a style for :func:`~.make_style` and :func:`~.dumps`.
+Type annotation representing a style for :func:`~.dumps` and :func:`~.dump`.
 
 The keys are CSS properties.
 
@@ -93,9 +86,11 @@ def dumps(
 		styles: Mapping[str, Union[Style, Mapping]],
 		*,
 		indent: str = TAB,
-		trailing_semicolon: bool = False,
+		trailing_semicolon: Optional[bool] = None,
 		indent_closing_brace: bool = False,
 		minify: bool = False,
+		sort_keys: bool = False,
+		check_circular: bool = True,
 		) -> str:
 	r"""
 	Construct a cascading style sheet from a dictionary.
@@ -139,10 +134,13 @@ def dumps(
 	:param trailing_semicolon:  Whether to add a semicolon to the end of the final property.
 	:param indent_closing_brace:
 	:param minify: Minify the CSS. Overrides all other options.
+	:param sort_keys: Sort dictionary keys alphabetically.
+	:param check_circular: Check for circular references.
 
 	:return: The style sheet as a string.
 
 	.. versionchanged:: 0.2.0  Added support for media at-rules.
+	.. versionchanged:: 0.5.0  New implementation. Output may differ slightly from previous css-parser based one.
 	"""
 
 	serializer = CSSSerializer(
@@ -150,27 +148,16 @@ def dumps(
 			trailing_semicolon=trailing_semicolon,
 			indent_closing_brace=indent_closing_brace,
 			minify=minify,
+			sort_keys=sort_keys,
+			check_circular=check_circular,
 			)
 
-	stylesheet: str = ''
-
-	with serializer.use():
-		sheet = StyleSheet()
-
-		for selector, style in styles.items():
-			if selector.startswith("@media"):
-				sheet.add_media_styles(selector.split("@media")[1].strip(), cast(Mapping[str, Style], style))
-			elif selector.startswith('@'):
-				raise NotImplementedError("Only @media at-rules are supported at this time.")
-			else:
-				sheet.add_style(selector, cast(Style, style))
+	css = serializer.encode(styles).rstrip()
 
-		stylesheet = sheet.tostring()
-
-	if not serializer.minify:
-		stylesheet = stylesheet.replace('}', "}\n")
-
-	return stylesheet
+	if css:
+		return css + '\n'
+	else:
+		return ''
 
 
 def dump(
@@ -178,9 +165,11 @@ def dump(
 		fp: Union[PathLike, IO],
 		*,
 		indent: str = TAB,
-		trailing_semicolon: bool = False,
+		trailing_semicolon: Optional[bool] = None,
 		indent_closing_brace: bool = False,
 		minify: bool = False,
+		sort_keys: bool = False,
+		check_circular: bool = True,
 		) -> None:
 	r"""
 	Construct a style sheet from a dictionary and write it to ``fp``.
@@ -225,12 +214,16 @@ def dump(
 	:param trailing_semicolon:  Whether to add a semicolon to the end of the final property.
 	:param indent_closing_brace:
 	:param minify: Minify the CSS. Overrides all other options.
+	:param sort_keys: Sort dictionary keys alphabetically.
+	:param check_circular: Check for circular references.
 
 	.. versionchanged:: 0.2.0
 
 		* ``fp`` now accepts :py:obj:`domdf_python_tools.typing.PathLike` objects,
 		  representing the path of a file to write to.
 		* Added support for media at-rules.
+
+	.. versionchanged:: 0.5.0  New implementation. Output may differ slightly from previous css-parser based one.
 	"""
 
 	css = dumps(
@@ -238,6 +231,8 @@ def dump(
 			indent=indent,
 			trailing_semicolon=trailing_semicolon,
 			indent_closing_brace=indent_closing_brace,
+			sort_keys=sort_keys,
+			check_circular=check_circular,
 			minify=minify,
 			)
 
@@ -252,43 +247,44 @@ def loads(styles: str) -> MutableMapping[str, MutableMapping[str, Any]]:
 	Parse a style sheet and return its dictionary representation.
 
 	.. versionadded:: 0.2.0
+	.. versionchanged:: 0.5.0  New implementation. Output may differ slightly from previous css-parser based one.
 
 	:param styles:
 
 	:return: The style sheet as a dictionary.
+
+	.. latex:clearpage::
 	"""
 
-	parser = css_parser.CSSParser(validate=False)
-	stylesheet: css_parser.css.CSSStyleSheet = parser.parseString(styles)
+	stylesheet = tinycss2.parse_blocks_contents(styles, skip_comments=True, skip_whitespace=True)
 
 	styles_dict: MutableMapping[str, MutableMapping[str, Any]] = {}
 
-	def parse_style(style: css_parser.css.CSSStyleDeclaration) -> MutableMapping[str, Property]:
+	def parse_style(style: List[tinycss2.ast.Node]) -> MutableMapping[str, Property]:
 		style_dict: Dict[str, Property] = {}
 
-		prop: css_parser.css.Property
-		for prop in style.children():
-			if prop.priority:
-				style_dict[prop.name] = (prop.value, prop.priority)
+		prop: Union[tinycss2.ast.ParseError, tinycss2.ast.Declaration]
+		for prop in tinycss2.parse_declaration_list(style, skip_comments=True, skip_whitespace=True):
+			if isinstance(prop, tinycss2.ast.ParseError):
+				raise ValueError(prop)
+
+			if prop.important:
+				style_dict[prop.name.strip()] = (_serialize(prop.value), IMPORTANT)
 			else:
-				style_dict[prop.name] = prop.value
+				style_dict[prop.name.strip()] = _serialize(prop.value)
 
 		return style_dict
 
-	rule: css_parser.css.CSSRule
-	for rule in stylesheet.cssRules:
-		if isinstance(rule, css_parser.css.CSSStyleRule):
-			styles_dict[rule.selectorText] = parse_style(rule.style)
-
-		elif isinstance(rule, css_parser.css.CSSMediaRule):
-			styles_dict[f"@media {rule.media.mediaText}"] = {}
+	rule: tinycss2.ast.Node
+	for rule in stylesheet:
+		if isinstance(rule, tinycss2.ast.QualifiedRule):
+			styles_dict[_serialize(rule.prelude)] = parse_style(rule.content)
 
-			for child in rule.cssRules:
-				styles_dict[f"@media {rule.media.mediaText}"][child.selectorText] = parse_style(child.style)
+		elif isinstance(rule, tinycss2.ast.AtRule):
+			at_rule_styles = styles_dict[f"@{rule.at_keyword} {_serialize(rule.prelude)}"] = {}
 
-		elif isinstance(rule, (css_parser.css.CSSComment)):  # pragma: no cover
-			# Ignore these classes
-			pass
+			for child in tinycss2.parse_blocks_contents(rule.content, skip_comments=True, skip_whitespace=True):
+				at_rule_styles[_serialize(child.prelude)] = parse_style(child.content)
 
 		else:
 			raise NotImplementedError(rule)
@@ -296,11 +292,16 @@ def parse_style(style: css_parser.css.CSSStyleDeclaration) -> MutableMapping[str
 	return styles_dict
 
 
+def _serialize(nodes: Iterable[tinycss2.ast.Node]) -> str:
+	return tinycss2.serialize(nodes).strip()
+
+
 def load(fp: Union[PathLike, IO]) -> MutableMapping[str, MutableMapping[str, Any]]:
 	r"""
 	Parse a cascading style sheet from the given file and return its dictionary representation.
 
 	.. versionadded:: 0.2.0
+	.. versionchanged:: 0.5.0  New implementation. Output may differ slightly from previous css-parser based one.
 
 	:param fp: An open file handle, or the filename of a file to write to.
 
@@ -313,93 +314,3 @@ def load(fp: Union[PathLike, IO]) -> MutableMapping[str, MutableMapping[str, Any
 		styles = PathPlus(fp).read_text()
 
 	return loads(styles)
-
-
-class StyleSheet(css_parser.css.CSSStyleSheet):
-	r"""
-	Represents a CSS style sheet.
-
-	.. raw:: latex
-
-		\nopagebreak
-
-	.. autosummary-widths:: 7/16
-
-	"""
-
-	def __init__(self):
-		super().__init__(validating=False)
-
-	def add(self, rule: css_parser.css.CSSRule) -> int:
-		"""
-		Add the ``rule`` to the style sheet.
-
-		:param rule:
-		:type rule: :class:`css_parser.css.CSSRule`
-		"""
-
-		return super().add(rule)
-
-	def add_style(
-			self,
-			selector: str,
-			styles: Style,
-			) -> None:
-		"""
-		Add a style to the style sheet.
-
-		:param selector:
-		:param styles:
-		"""
-
-		self.add(make_style(selector, styles))
-
-	def add_media_styles(
-			self,
-			media_query: str,
-			styles: Mapping[str, Style],
-			) -> None:
-		"""
-		Add a set of styles for a media query to the style sheet.
-
-		.. versionadded:: 0.2.0
-
-		:param media_query:
-		:param styles:
-		"""
-
-		media = css_parser.css.CSSMediaRule(media_query)
-
-		for selector, style in styles.items():
-			media.add(make_style(selector, style))
-
-		self.add(media)
-
-	def tostring(self) -> str:
-		"""
-		Returns the style sheet as a string.
-		"""
-
-		return self.cssText.decode("UTF-8")
-
-
-def make_style(selector: str, styles: Style) -> css_parser.css.CSSStyleRule:
-	"""
-	Create a CSS Style Rule from a dictionary.
-
-	:param selector:
-	:param styles:
-
-	:rtype: :class:`css_parser.css.CSSStyleRule`
-	"""
-
-	style = css_parser.css.CSSStyleDeclaration()
-	style.validating = False
-
-	for name, properties in styles.items():
-		if isinstance(properties, Sequence) and not isinstance(properties, str):
-			style[name] = tuple(str(x) for x in properties)
-		else:
-			style[name] = str(properties)
-
-	return css_parser.css.CSSStyleRule(selectorText=selector, style=style)
diff --git a/dict2css/serializer.py b/dict2css/serializer.py
index d904228..6169b32 100644
--- a/dict2css/serializer.py
+++ b/dict2css/serializer.py
@@ -9,6 +9,9 @@
 #
 #  Copyright © 2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
 #
+#  Adapted from https://github.com/austinyu/ujson5
+#  Copyright (c) 2025 Sir Austin
+#
 #  Permission is hereby granted, free of charge, to any person obtaining a copy
 #  of this software and associated documentation files (the "Software"), to deal
 #  in the Software without restriction, including without limitation the rights
@@ -29,25 +32,47 @@
 #
 
 # stdlib
+import re
 from contextlib import contextmanager
-from typing import Iterator
+from typing import Any, Callable, Dict, Iterable, Iterator, Mapping, Optional, Union
 
 # 3rd party
 from domdf_python_tools.words import TAB
 
-try:
-	# 3rd party
-	import css_parser  # type: ignore
-except ImportError:  # pragma: no cover
-	# 3rd party
-	import cssutils as css_parser  # type: ignore
-
 __all__ = ["CSSSerializer"]
 
+#: Python objects that can be serialized to CSS
+Serializable = Union[dict, list, tuple, int, float, str, bool, None]
+
+#: A callable that takes in an object that is not serializable and returns a serializable object
+DefaultInterface = Union[
+	Callable[[Any], dict],
+	Callable[[Any], list],
+	Callable[[Any], tuple],
+	Callable[[Any], int],
+	Callable[[Any], float],
+	Callable[[Any], str],
+	Callable[[Any], bool],
+	Callable[[Any], Serializable]
+	]
 
-class CSSSerializer(css_parser.CSSSerializer):
+ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
+ESCAPE_DCT = {
+		'\\': "\\\\",
+		'"': '\\"',
+		'\x08': "\\b",
+		'\x0c': "\\f",
+		'\n': "\\n",
+		'\r': "\\r",
+		'\t': "\\t",
+		}
+for i in range(0x20):
+	ESCAPE_DCT.setdefault(chr(i), f"\\u{i:04x}")
+
+
+class CSSSerializer:
 	r"""
-	Serializes a :class:`~.StyleSheet` and its parts.
+	Serializes a dictionary to CSS.
 
 	This controls the formatting of the style sheet.
 
@@ -55,57 +80,308 @@ class CSSSerializer(css_parser.CSSSerializer):
 	:param trailing_semicolon:  Whether to add a semicolon to the end of the final property.
 	:param indent_closing_brace:
 	:param minify: Minify the CSS. Overrides all other options.
+	:param sort_keys: Sort dictionary keys alphabetically.
+	:param check_circular: Check for circular references.
+
+	.. versionchanged:: 0.5.0  New implementation. Output may differ slightly from previous css-parser based one.
 
-	.. autosummary-widths:: 5/16
+	.. autosummary-widths:: 1/4
 	"""
 
 	def __init__(
 			self,
 			*,
 			indent: str = TAB,
-			trailing_semicolon: bool = False,
+			trailing_semicolon: Optional[bool] = None,
+			indent_closing_brace: bool = False,
+			minify: bool = False,
+			sort_keys: bool = False,
+			check_circular: bool = True,  # default: Optional[DefaultInterface] = None,
+			) -> None:
+		self._set_options(
+				indent=indent,
+				trailing_semicolon=trailing_semicolon,
+				indent_closing_brace=indent_closing_brace,
+				minify=minify,
+				sort_keys=sort_keys,
+				)
+
+		if check_circular:
+			self._markers: Optional[Dict[int, Any]] = {}
+		else:
+			self._markers = None
+
+		# TODO self._default: Optional[DefaultInterface] = default
+		self._default: Optional[DefaultInterface] = None
+
+	def _set_options(
+			self,
+			indent: str = TAB,
+			trailing_semicolon: Optional[bool] = None,
 			indent_closing_brace: bool = False,
 			minify: bool = False,
-			):
-		super().__init__()
-		self.indent = str(indent)
-		self.trailing_semicolon = trailing_semicolon
-		self.indent_closing_brace = indent_closing_brace
-		self.minify = minify
-
-	def reset_style(self) -> None:
+			sort_keys: bool = False,
+			) -> None:
+
+		self._sort_keys: bool = sort_keys
+		self._indent_str: Optional[str] = None if minify else indent
+
+		if minify:
+			self._key_separator: str = ':'
+		else:
+			self._key_separator = ": "
+
+		if not indent and not minify:
+			self._item_separator: str = "; "
+		else:
+			self._item_separator = ';'
+
+		if minify:
+			self._trailing_semicolon = False
+		elif trailing_semicolon is None:
+			self._trailing_semicolon = indent is not None
+		else:
+			self._trailing_semicolon = trailing_semicolon
+
+		if indent_closing_brace and indent is not None:
+			self._indent_closing_brace = True
+		else:
+			self._indent_closing_brace = False
+
+		self._minify = minify
+
+	# TODO: deprecate
+	def reset_style(self) -> None:  # pragma: no cover
 		"""
 		Reset the serializer to its default style.
 		"""
 
-		# Reset CSS Parser to defaults
-		self.prefs.useDefaults()
+		self._set_options()
 
-		if self.minify:
-			self.prefs.useMinified()
+	def encode(self, obj: Mapping) -> str:
+		"""
+		Return a CSS representation of a Python dictionary.
 
-		else:
-			# Formatting preferences
-			self.prefs.omitLastSemicolon = not self.trailing_semicolon
-			self.prefs.indentClosingBrace = self.indent_closing_brace
-			self.prefs.indent = self.indent
+		:param obj: The Python dictionary to be serialized
 
-	@contextmanager
-	def use(self) -> Iterator:
+		:returns: The CSS string representation of the Python dictionary
+		"""
+
+		return ''.join(self.iterencode(obj))
+
+	def iterencode(self, obj: Mapping) -> Iterable[str]:
+		"""
+		Encode the given dictionary and yield each part of the CSS string representation.
+
+		:param obj: The Python dictionary to be serialized
+
+		:returns: An iterable of strings representing the CSS serialization of the Python dictionary.
 		"""
-		Contextmanager to use this serializer for the scope of the ``with`` block.
+
+		if not isinstance(obj, Mapping):
+			raise TypeError(f"Cannot convert {type(obj)} to CSS")
+
+		return self._iterencode_dict(obj, indent_level=-1)
+
+	def default(self, obj: Any) -> Serializable:
 		"""
+		Override this method in a subclass to implement custom serialization for objects that are not serializable by default.
+
+		This method should return a serializable object.
+		If this method is not overridden, the encoder will raise a :exc:`ValueError` when trying to encode an unsupported object.
+
+		:param obj: The object to be serialized that is not supported by default.
+
+		:returns: A serializable object
+
+		:raises: ValueError: If the object cannot be serialized
+		"""
+
+		if self._default is not None:  # pragma no cover  # TODO
+			return self._default(obj)
+
+		raise ValueError(f"Object of type {obj.__class__.__name__} cannot be represented in CSS")
 
-		# if css_parser.ser is self:
-		# 	yield
-		# 	return
-		#
-		current_serializer = css_parser.ser
-		self.reset_style()
+	def _encode_float(self, obj: float) -> str:
+		if obj != obj or obj == float("inf") or obj == float("-inf"):
+			raise ValueError(f"Out of range float values are not allowed: {repr(obj)}")
+		else:
+			return repr(obj)
+
+	def _encode_str(self, obj: str) -> str:
+
+		def replace_unicode(match: re.Match) -> str:  # pragma: no cover  # TODO
+			return ESCAPE_DCT[match.group(0)]
+
+		return ESCAPE.sub(replace_unicode, obj)
+
+	def _iterencode(self, obj: Any, indent_level: int) -> Iterable[str]:
+		if isinstance(obj, str):
+			yield self._encode_str(obj)
+		elif obj is True:
+			yield "true"
+		elif obj is False:
+			yield "false"
+		elif obj is None:
+			yield "none"
+		elif isinstance(obj, int):
+			yield repr(obj)
+		elif isinstance(obj, float):
+			yield self._encode_float(obj)
+		elif isinstance(obj, (list, tuple)):  # pragma: no cover  # TODO (needs default exposed)
+			yield from self._iterencode_list(obj, indent_level)
+		elif isinstance(obj, dict):  # pragma: no cover  # TODO (needs default exposed)
+			yield from self._iterencode_dict(obj, indent_level)
+		else:
+			if self._markers is not None:
+				marker_id: Optional[int] = id(obj)
+				if marker_id in self._markers:  # pragma: no cover  # TODO (super edge case)
+					raise ValueError("Circular reference detected")
+				assert marker_id is not None
+				self._markers[marker_id] = obj
+			else:
+				marker_id = None
+
+			obj_user = self.default(obj)
+			yield from self._iterencode(obj_user, indent_level)  # pragma: no cover  # TODO (needs default exposed)
+
+			if self._markers is not None and marker_id is not None:  # pragma: no cover  # TODO (needs default exposed)
+				del self._markers[marker_id]
+
+	def _iterencode_list(
+			self,
+			obj: Union[list, tuple, None],
+			indent_level: int,
+			) -> Iterable[str]:
+
+		# this package
+		from dict2css import IMPORTANT
+
+		if not obj:
+			raise ValueError("Property cannot be empty")
+
+		if self._markers is not None:
+			marker_id: Optional[int] = id(obj)
+			if marker_id in self._markers:  # pragma: no cover  # TODO (super edge case)
+				raise ValueError("Circular reference detected")
+			assert marker_id is not None
+			self._markers[marker_id] = obj
+		else:
+			marker_id = None
+
+		first: bool = True
+		for value in obj:
+			if first:
+				yield ''
+				first = False
+			else:
+				yield ' '
+
+			if value == IMPORTANT:
+				yield "!important"
+			else:
+				yield from self._iterencode(value, indent_level)
+
+		if self._markers is not None and marker_id is not None:
+			del self._markers[marker_id]
+
+	def _iterencode_dict(
+			self,
+			obj: Mapping[str, Any],
+			indent_level: int,
+			) -> Iterable[str]:
+		if not obj:
+			if indent_level >= 0:
+				yield "{}"
+
+			return
+
+		if self._markers is not None:
+			marker_id: Optional[int] = id(obj)
+			if marker_id in self._markers:
+				raise ValueError("Circular reference detected")
+			assert marker_id is not None
+			self._markers[marker_id] = obj
+		else:
+			marker_id = None
 
-		try:
-			css_parser.ser = self
-			yield
+		if indent_level >= 0:
+			yield '{'
+
+		minify_indent = False
+		if self._minify or not self._indent_str:
+			# No indent
+			newline_indent: Optional[str] = None
+
+			if indent_level == -1:
+				indent_level += 1
+				minify_indent = True
+
+		else:
+			indent_level += 1
+			newline_indent = '\n' + self._indent_str * indent_level
+			assert newline_indent is not None
+
+			if indent_level > 0:
+				yield newline_indent
+
+		first = True
+		if self._sort_keys:
+			items: Any = sorted(obj.items())
+		else:
+			items = obj.items()
+
+		total_items: int = len(items)
+		for idx, (key, value) in enumerate(items):
+			if not isinstance(key, str):
+				raise TypeError(f"keys must be strings, not {key.__class__.__name__}")
+
+			if first:
+				first = False
+			elif newline_indent is not None:
+				yield newline_indent  # we do not need to yield anything if indent == 0
+			yield self._encode_str(key)
+
+			if isinstance(value, dict):
+				if not self._minify:
+					yield ' '
+
+				yield from self._iterencode_dict(value, indent_level)
+			else:
+				yield self._key_separator
+
+				if isinstance(value, (list, tuple)):
+					yield from self._iterencode_list(value, indent_level)
+				else:
+					yield from self._iterencode(value, indent_level)
+
+				if idx != total_items - 1 or self._trailing_semicolon:
+					yield self._item_separator
+
+		if self._indent_str:
+			indent_level -= 1
+			yield '\n' + self._indent_str * indent_level
+		elif minify_indent:
+			indent_level -= 1
+
+		if indent_level >= 0:
+			if self._indent_closing_brace:
+				assert self._indent_str is not None
+				yield self._indent_str
+
+			yield '}'
+
+			if not self._minify:
+				yield '\n'
+
+		if self._markers is not None and marker_id is not None:
+			del self._markers[marker_id]
+
+	# TODO: deprecate
+	@contextmanager
+	def use(self) -> Iterator:  # pragma: no cover
+		"""
+		No-op. Deprecated.
+		"""
 
-		finally:
-			css_parser.ser = current_serializer
+		yield
diff --git a/doc-source/changelog.rst b/doc-source/changelog.rst
index 7cc0218..4c38a44 100644
--- a/doc-source/changelog.rst
+++ b/doc-source/changelog.rst
@@ -6,7 +6,11 @@ Changelog
 0.5.0
 -------
 
-Drop support for Python 3.7
+* Drop support for Python 3.7
+* Reimplement ``load(s)`` using ``tinycss2`` and ``dump(s)`` using a modified version of ``ujson5``
+* Remove ``StyleSheet`` and ``make_style``
+
+.. changelog:: 0.5.0
 
 
 0.4.0
diff --git a/doc-source/conf.py b/doc-source/conf.py
index d8b0a88..8c2a0f8 100644
--- a/doc-source/conf.py
+++ b/doc-source/conf.py
@@ -101,5 +101,4 @@ def setup(app):
 
 nitpicky = True
 latex_elements["preamble"] = "\\raggedbottom\n\\widowpenalty10000"
-ignore_missing_xrefs = ["^css_parser\\."]
 changelog_sections_numbered = False
diff --git a/pyproject.toml b/pyproject.toml
index 42e57ff..64b8c56 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -139,9 +139,6 @@ reformat = true
 
 [tool.snippet-fmt.languages.json]
 
-[tool.dep_checker]
-allowed_unused = [ "cssutils",]
-
 [tool.dependency-dash."requirements.txt"]
 order = 10
 
diff --git a/repo_helper.yml b/repo_helper.yml
index a29fa08..be33fbb 100644
--- a/repo_helper.yml
+++ b/repo_helper.yml
@@ -40,7 +40,6 @@ classifiers:
 sphinx_conf_epilogue:
  - nitpicky = True
  - latex_elements["preamble"] = "\\raggedbottom\n\\widowpenalty10000"
- - ignore_missing_xrefs = ["^css_parser\\."]
  - changelog_sections_numbered = False
 
 exclude_files:
@@ -54,6 +53,3 @@ extra_sphinx_extensions:
  - sphinx_toolbox_experimental.missing_xref
  - sphinx_toolbox_experimental.changelog
  - latex_mu
-
-tox_unmanaged:
- - testenv
diff --git a/requirements.txt b/requirements.txt
index 5b4d1d8..241bfb1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,2 @@
-# css-parser>=1.0.6
-# Later cssutils polluted by AI and the new licence-breaking chardet
-cssutils<=2.11.0,>=2.2.0
 domdf-python-tools>=2.2.0
+tinycss2>=1.2.1
diff --git a/tests/test_dict2css.py b/tests/test_dict2css.py
index 42301cb..ad275bb 100644
--- a/tests/test_dict2css.py
+++ b/tests/test_dict2css.py
@@ -1,55 +1,101 @@
 # stdlib
-from typing import Dict, Mapping, MutableMapping
+from ipaddress import IPv4Address
+from typing import Dict, Mapping, MutableMapping, no_type_check
 
 # 3rd party
-import cssutils  # type: ignore
 import pytest
 from coincidence.regressions import AdvancedDataRegressionFixture, AdvancedFileRegressionFixture
 from domdf_python_tools.paths import PathPlus
-from domdf_python_tools.stringlist import StringList
 from domdf_python_tools.words import TAB
 
 # this package
-from dict2css import IMPORTANT, Style, StyleSheet, dump, dumps, load, loads, make_style
+from dict2css import IMPORTANT, Style, dump, dumps, load, loads
 from dict2css.helpers import em, px, rem
-from dict2css.serializer import CSSSerializer
 
 
-def test_stylesheet(advanced_file_regression: AdvancedFileRegressionFixture):
-	serializer = CSSSerializer(indent="  ", trailing_semicolon=True)
+def boolean_option(name: str, id: str):  # noqa: A002,MAN002  # pylint: disable=redefined-builtin
+	return pytest.mark.parametrize(
+			name,
+			[
+					pytest.param(True, id=id),
+					pytest.param(False, id=f"not {id}"),
+					],
+			)
+
+
+@no_type_check
+def test_dumps_not_mapping():
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps([1, 2, 3])
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps((1, 2, 3))
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps("ABC")
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps(123)
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps(123.456)
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps(True)
+
+	with pytest.raises(TypeError, match="Cannot convert .* to CSS"):
+		dumps(None)
 
-	with serializer.use():
-		sheet = StyleSheet()
 
-		# Body width
-		sheet.add_style(".wy-nav-content", {"max-width": (px(1200), IMPORTANT)})
+@no_type_check
+@boolean_option("check_circular", "check_circular")
+def test_dumps_unknown_type(check_circular: bool):
+	with pytest.raises(ValueError, match="Object of type .* cannot be represented in CSS"):
+		dumps({"the_key": IPv4Address("127.0.0.1")}, check_circular=check_circular)
 
-		# Spacing between list items
-		sheet.add_style("li p:last-child", {"margin-bottom": (px(12), IMPORTANT)})
 
-		# Smooth scrolling between sections
-		sheet.add_style("html", {"scroll-behavior": "smooth"})
+@no_type_check
+def test_dumps_bad_floats():
+	with pytest.raises(ValueError, match="Out of range float values are not allowed:"):
+		dumps({"the_key": float("inf")})
 
-		stylesheet = sheet.tostring().replace('}', "}\n")
+	with pytest.raises(ValueError, match="Out of range float values are not allowed:"):
+		dumps({"the_key": float("-inf")})
 
-		advanced_file_regression.check(stylesheet, extension=".css")
+	with pytest.raises(ValueError, match="Out of range float values are not allowed:"):
+		dumps({"the_key": float("nan")})
 
 
-@pytest.mark.parametrize("trailing_semicolon", [True, False])
-@pytest.mark.parametrize("indent_closing_brace", [True, False])
-@pytest.mark.parametrize("indent", [TAB, "  ", "    "])
+@boolean_option("check_circular", "check_circular")
+@boolean_option("sort_keys", "sort_keys")
+@boolean_option("trailing_semicolon", "trailing_semicolon")
+@boolean_option("indent_closing_brace", "indent_closing_brace")
+@pytest.mark.parametrize(
+		"indent",
+		[
+				pytest.param(TAB, id="tab"),
+				pytest.param("  ", id='2'),
+				pytest.param("    ", id='4'),
+				pytest.param('', id='0'),
+				],
+		)
 def test_dumps(
 		advanced_file_regression: AdvancedFileRegressionFixture,
 		trailing_semicolon: bool,
 		indent_closing_brace: bool,
 		indent: str,
+		check_circular: bool,
+		sort_keys: bool,
 		tmp_pathplus: PathPlus,
 		):
 	stylesheet: Dict[str, Style] = {
-			".wy-nav-content": {"max-width": (rem(1200), IMPORTANT)},
+			".wy-nav-content": {"max-width": (rem(1200), IMPORTANT), "z-index": 999},
 			"li p:last-child": {
 					"margin-bottom": (em(12), IMPORTANT),
 					"margin-top": em(6),
+					"font-size": px(14),
+					"line-height": 1.5,
+					"font-weight": (800, IMPORTANT),
 					},
 			"html": {"scroll-behavior": "smooth"},
 			}
@@ -59,6 +105,8 @@ def test_dumps(
 			indent=indent,
 			trailing_semicolon=trailing_semicolon,
 			indent_closing_brace=indent_closing_brace,
+			check_circular=check_circular,
+			sort_keys=sort_keys,
 			)
 	advanced_file_regression.check(css, extension=".css")
 
@@ -71,6 +119,8 @@ def test_dumps(
 				indent=indent,
 				trailing_semicolon=trailing_semicolon,
 				indent_closing_brace=indent_closing_brace,
+				check_circular=check_circular,
+				sort_keys=sort_keys,
 				)
 
 	advanced_file_regression.check_file(output_file)
@@ -81,33 +131,16 @@ def test_dumps(
 			indent=indent,
 			trailing_semicolon=trailing_semicolon,
 			indent_closing_brace=indent_closing_brace,
+			check_circular=check_circular,
+			sort_keys=sort_keys,
 			)
 
 	advanced_file_regression.check_file(output_file)
 
 
-def test_make_style():
-	style: cssutils.css.CSSStyleRule = make_style("li p:last-child", {"max-width": (rem(1200), IMPORTANT)})
-	assert str(style.selectorText) == "li p:last-child"
-	assert StringList(style.cssText) == [
-			"li p:last-child {",
-			"    max-width: 1200rem !important",
-			"    }",
-			]
-
-	serializer = CSSSerializer(trailing_semicolon=True)
-
-	with serializer.use():
-		assert StringList(style.cssText) == [
-				"li p:last-child {",
-				"\tmax-width: 1200rem !important;",
-				'}',
-				]
-
-
 def test_dump_minify(advanced_file_regression: AdvancedFileRegressionFixture, tmp_pathplus: PathPlus):
 	stylesheet: Dict[str, Style] = {
-			".wy-nav-content": {"max-width": (rem(1200), IMPORTANT)},
+			".wy-nav-content": {"max-width": (rem(1200), IMPORTANT), "box-shadow": None},
 			"li p:last-child": {
 					"margin-bottom": (em(12), IMPORTANT),
 					"margin-top": em(6),
@@ -192,3 +225,40 @@ def test_loads(advanced_data_regression: AdvancedDataRegressionFixture, tmp_path
 
 	with style_file.open() as fp:
 		assert load(fp) == stylesheet
+
+
+def test_loads_bad_syntax():
+	style = [
+			".wy-nav-content {",
+			"    max-width",
+			"    }",
+			]
+
+	with pytest.raises(ValueError, match="<ParseError invalid>"):
+		loads('\n'.join(style))
+
+
+@no_type_check
+def test_circular_references():
+	css = {
+			'a': {'b': 'c'},
+			}
+	css['d'] = css
+
+	with pytest.raises(ValueError, match="Circular reference detected"):
+		dumps(css)
+
+
+def test_edge_cases():
+	with pytest.raises(TypeError, match="keys must be strings, not"):
+		dumps({1234: {'a': 'b'}})  # type: ignore[dict-item]
+
+	with pytest.raises(ValueError, match="Property cannot be empty"):
+		dumps({'a': {'b': ()}})
+
+	assert dumps({}) == ''
+	assert dumps({'a': {}}) == "a {}\n"
+	assert dumps({'a': {'b': True}}, indent='') == "a {b: true; }\n"
+	assert dumps({'a': {'b': False}}, indent='') == "a {b: false; }\n"
+
+	assert dumps({'a': {'b': ('c', ('d', ))}}) == 'a {\n\tb: c d;\n}\n'
diff --git a/tests/test_dict2css_/test_dump_minify.css b/tests/test_dict2css_/test_dump_minify.css
index 210a232..d65e856 100644
--- a/tests/test_dict2css_/test_dump_minify.css
+++ b/tests/test_dict2css_/test_dump_minify.css
@@ -1 +1 @@
-.wy-nav-content{max-width:1200rem !important}li p:last-child{margin-bottom:12em !important;margin-top:6em}html{scroll-behavior:smooth}
+.wy-nav-content{max-width:1200rem !important;box-shadow:none}li p:last-child{margin-bottom:12em !important;margin-top:6em}html{scroll-behavior:smooth}
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..187f96e
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important}
+html {scroll-behavior: smooth}
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..187f96e
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important}
+html {scroll-behavior: smooth}
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..b71a82a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+html {scroll-behavior: smooth}
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em}
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..b71a82a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+html {scroll-behavior: smooth}
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em}
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..ff02894
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important; }
+html {scroll-behavior: smooth; }
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..ff02894
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important; }
+html {scroll-behavior: smooth; }
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..7c02e55
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+html {scroll-behavior: smooth; }
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em; }
diff --git a/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..7c02e55
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+html {scroll-behavior: smooth; }
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em; }
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..187f96e
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important}
+html {scroll-behavior: smooth}
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..187f96e
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important}
+html {scroll-behavior: smooth}
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..b71a82a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+html {scroll-behavior: smooth}
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em}
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..b71a82a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999}
+html {scroll-behavior: smooth}
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em}
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..ff02894
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important; }
+html {scroll-behavior: smooth; }
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..ff02894
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+li p:last-child {margin-bottom: 12em !important; margin-top: 6em; font-size: 14px; line-height: 1.5; font-weight: 800 !important; }
+html {scroll-behavior: smooth; }
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..7c02e55
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+html {scroll-behavior: smooth; }
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em; }
diff --git a/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..7c02e55
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_0_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,3 @@
+.wy-nav-content {max-width: 1200rem !important; z-index: 999; }
+html {scroll-behavior: smooth; }
+li p:last-child {font-size: 14px; font-weight: 800 !important; line-height: 1.5; margin-bottom: 12em !important; margin-top: 6em; }
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..6afd4a9
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+  }
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important
+  }
+
+html {
+  scroll-behavior: smooth
+  }
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..6afd4a9
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+  }
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important
+  }
+
+html {
+  scroll-behavior: smooth
+  }
diff --git a/tests/test_dict2css_/test_dumps____True_False_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 53%
rename from tests/test_dict2css_/test_dumps____True_False_.css
rename to tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index bac0891..c6d1b0d 100644
--- a/tests/test_dict2css_/test_dumps____True_False_.css
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-  max-width: 1200rem !important
+  max-width: 1200rem !important;
+  z-index: 999
+  }
+
+html {
+  scroll-behavior: smooth
   }
 
 li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
   margin-bottom: 12em !important;
   margin-top: 6em
   }
-
-html {
-  scroll-behavior: smooth
-  }
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..c6d1b0d
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+  }
+
+html {
+  scroll-behavior: smooth
+  }
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em
+  }
diff --git a/tests/test_dict2css_/test_dumps____True_True_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 66%
rename from tests/test_dict2css_/test_dumps____True_True_.css
rename to tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index 639a7ab..905e248 100644
--- a/tests/test_dict2css_/test_dumps____True_True_.css
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
   max-width: 1200rem !important;
+  z-index: 999;
   }
 
 li p:last-child {
   margin-bottom: 12em !important;
   margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important;
   }
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..905e248
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+  }
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important;
+  }
+
+html {
+  scroll-behavior: smooth;
+  }
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..5c89a40
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+  }
+
+html {
+  scroll-behavior: smooth;
+  }
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  }
diff --git a/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..5c89a40
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+  }
+
+html {
+  scroll-behavior: smooth;
+  }
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  }
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..5c14ff5
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+}
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important
+}
+
+html {
+  scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..5c14ff5
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+}
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important
+}
+
+html {
+  scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps____False_False_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 52%
rename from tests/test_dict2css_/test_dumps____False_False_.css
rename to tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index be1415b..b18f4e0 100644
--- a/tests/test_dict2css_/test_dumps____False_False_.css
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-  max-width: 1200rem !important
+  max-width: 1200rem !important;
+  z-index: 999
+}
+
+html {
+  scroll-behavior: smooth
 }
 
 li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
   margin-bottom: 12em !important;
   margin-top: 6em
 }
-
-html {
-  scroll-behavior: smooth
-}
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..b18f4e0
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999
+}
+
+html {
+  scroll-behavior: smooth
+}
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em
+}
diff --git a/tests/test_dict2css_/test_dumps____False_True_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 65%
rename from tests/test_dict2css_/test_dumps____False_True_.css
rename to tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index 1cf3c1d..2dc8aba 100644
--- a/tests/test_dict2css_/test_dumps____False_True_.css
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
   max-width: 1200rem !important;
+  z-index: 999;
 }
 
 li p:last-child {
   margin-bottom: 12em !important;
   margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important;
 }
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..2dc8aba
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+}
+
+li p:last-child {
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+  font-size: 14px;
+  line-height: 1.5;
+  font-weight: 800 !important;
+}
+
+html {
+  scroll-behavior: smooth;
+}
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..b0dc652
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+}
+
+html {
+  scroll-behavior: smooth;
+}
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..b0dc652
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_2_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+  max-width: 1200rem !important;
+  z-index: 999;
+}
+
+html {
+  scroll-behavior: smooth;
+}
+
+li p:last-child {
+  font-size: 14px;
+  font-weight: 800 !important;
+  line-height: 1.5;
+  margin-bottom: 12em !important;
+  margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..ffbd0e7
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+    }
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important
+    }
+
+html {
+    scroll-behavior: smooth
+    }
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..ffbd0e7
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+    }
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important
+    }
+
+html {
+    scroll-behavior: smooth
+    }
diff --git a/tests/test_dict2css_/test_dumps______True_False_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 53%
rename from tests/test_dict2css_/test_dumps______True_False_.css
rename to tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index cce7634..8718aed 100644
--- a/tests/test_dict2css_/test_dumps______True_False_.css
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-    max-width: 1200rem !important
+    max-width: 1200rem !important;
+    z-index: 999
+    }
+
+html {
+    scroll-behavior: smooth
     }
 
 li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
     margin-bottom: 12em !important;
     margin-top: 6em
     }
-
-html {
-    scroll-behavior: smooth
-    }
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..8718aed
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+    }
+
+html {
+    scroll-behavior: smooth
+    }
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em
+    }
diff --git a/tests/test_dict2css_/test_dumps______True_True_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 66%
rename from tests/test_dict2css_/test_dumps______True_True_.css
rename to tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index 056d939..67a5fe0 100644
--- a/tests/test_dict2css_/test_dumps______True_True_.css
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
     max-width: 1200rem !important;
+    z-index: 999;
     }
 
 li p:last-child {
     margin-bottom: 12em !important;
     margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important;
     }
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..67a5fe0
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+    }
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important;
+    }
+
+html {
+    scroll-behavior: smooth;
+    }
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..49a3b1a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+    }
+
+html {
+    scroll-behavior: smooth;
+    }
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    }
diff --git a/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..49a3b1a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+    }
+
+html {
+    scroll-behavior: smooth;
+    }
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    }
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..76b9976
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+}
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important
+}
+
+html {
+    scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..76b9976
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+}
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important
+}
+
+html {
+    scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps______False_False_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 51%
rename from tests/test_dict2css_/test_dumps______False_False_.css
rename to tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index 43fbdb2..9adc67a 100644
--- a/tests/test_dict2css_/test_dumps______False_False_.css
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-    max-width: 1200rem !important
+    max-width: 1200rem !important;
+    z-index: 999
+}
+
+html {
+    scroll-behavior: smooth
 }
 
 li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
     margin-bottom: 12em !important;
     margin-top: 6em
 }
-
-html {
-    scroll-behavior: smooth
-}
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..9adc67a
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999
+}
+
+html {
+    scroll-behavior: smooth
+}
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em
+}
diff --git a/tests/test_dict2css_/test_dumps______False_True_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 64%
rename from tests/test_dict2css_/test_dumps______False_True_.css
rename to tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index d84370c..19c3f36 100644
--- a/tests/test_dict2css_/test_dumps______False_True_.css
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
     max-width: 1200rem !important;
+    z-index: 999;
 }
 
 li p:last-child {
     margin-bottom: 12em !important;
     margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important;
 }
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..19c3f36
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+}
+
+li p:last-child {
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+    font-size: 14px;
+    line-height: 1.5;
+    font-weight: 800 !important;
+}
+
+html {
+    scroll-behavior: smooth;
+}
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..8a67610
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+}
+
+html {
+    scroll-behavior: smooth;
+}
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..8a67610
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_4_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+    max-width: 1200rem !important;
+    z-index: 999;
+}
+
+html {
+    scroll-behavior: smooth;
+}
+
+li p:last-child {
+    font-size: 14px;
+    font-weight: 800 !important;
+    line-height: 1.5;
+    margin-bottom: 12em !important;
+    margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..fa2263f
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+	}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important
+	}
+
+html {
+	scroll-behavior: smooth
+	}
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..fa2263f
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+	}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important
+	}
+
+html {
+	scroll-behavior: smooth
+	}
diff --git a/tests/test_dict2css_/test_dumps__t_True_False_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 53%
rename from tests/test_dict2css_/test_dumps__t_True_False_.css
rename to tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index bbe19ce..306b110 100644
--- a/tests/test_dict2css_/test_dumps__t_True_False_.css
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-	max-width: 1200rem !important
+	max-width: 1200rem !important;
+	z-index: 999
+	}
+
+html {
+	scroll-behavior: smooth
 	}
 
 li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
 	margin-bottom: 12em !important;
 	margin-top: 6em
 	}
-
-html {
-	scroll-behavior: smooth
-	}
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..306b110
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+	}
+
+html {
+	scroll-behavior: smooth
+	}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em
+	}
diff --git a/tests/test_dict2css_/test_dumps__t_True_True_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 66%
rename from tests/test_dict2css_/test_dumps__t_True_True_.css
rename to tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index 3c47fb8..60d3152 100644
--- a/tests/test_dict2css_/test_dumps__t_True_True_.css
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
 	max-width: 1200rem !important;
+	z-index: 999;
 	}
 
 li p:last-child {
 	margin-bottom: 12em !important;
 	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important;
 	}
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..60d3152
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+	}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important;
+	}
+
+html {
+	scroll-behavior: smooth;
+	}
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..19529d1
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+	}
+
+html {
+	scroll-behavior: smooth;
+	}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	}
diff --git a/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..19529d1
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+	}
+
+html {
+	scroll-behavior: smooth;
+	}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	}
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
new file mode 100644
index 0000000..ba6d847
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important
+}
+
+html {
+	scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..ba6d847
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important
+}
+
+html {
+	scroll-behavior: smooth
+}
diff --git a/tests/test_dict2css_/test_dumps__t_False_False_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
similarity index 52%
rename from tests/test_dict2css_/test_dumps__t_False_False_.css
rename to tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
index fe9a067..1efa5e5 100644
--- a/tests/test_dict2css_/test_dumps__t_False_False_.css
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_check_circular_.css
@@ -1,12 +1,16 @@
 .wy-nav-content {
-	max-width: 1200rem !important
+	max-width: 1200rem !important;
+	z-index: 999
+}
+
+html {
+	scroll-behavior: smooth
 }
 
 li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
 	margin-bottom: 12em !important;
 	margin-top: 6em
 }
-
-html {
-	scroll-behavior: smooth
-}
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..1efa5e5
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_not_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999
+}
+
+html {
+	scroll-behavior: smooth
+}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em
+}
diff --git a/tests/test_dict2css_/test_dumps__t_False_True_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
similarity index 66%
rename from tests/test_dict2css_/test_dumps__t_False_True_.css
rename to tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
index 6b4100e..d5a9c42 100644
--- a/tests/test_dict2css_/test_dumps__t_False_True_.css
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_check_circular_.css
@@ -1,10 +1,14 @@
 .wy-nav-content {
 	max-width: 1200rem !important;
+	z-index: 999;
 }
 
 li p:last-child {
 	margin-bottom: 12em !important;
 	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important;
 }
 
 html {
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..d5a9c42
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_not_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+}
+
+li p:last-child {
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+	font-size: 14px;
+	line-height: 1.5;
+	font-weight: 800 !important;
+}
+
+html {
+	scroll-behavior: smooth;
+}
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
new file mode 100644
index 0000000..fb0383d
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+}
+
+html {
+	scroll-behavior: smooth;
+}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
new file mode 100644
index 0000000..fb0383d
--- /dev/null
+++ b/tests/test_dict2css_/test_dumps_tab_not_indent_closing_brace_trailing_semicolon_sort_keys_not_check_circular_.css
@@ -0,0 +1,16 @@
+.wy-nav-content {
+	max-width: 1200rem !important;
+	z-index: 999;
+}
+
+html {
+	scroll-behavior: smooth;
+}
+
+li p:last-child {
+	font-size: 14px;
+	font-weight: 800 !important;
+	line-height: 1.5;
+	margin-bottom: 12em !important;
+	margin-top: 6em;
+}
diff --git a/tests/test_dict2css_/test_stylesheet.css b/tests/test_dict2css_/test_stylesheet.css
deleted file mode 100644
index 2fe26dc..0000000
--- a/tests/test_dict2css_/test_stylesheet.css
+++ /dev/null
@@ -1,11 +0,0 @@
-.wy-nav-content {
-  max-width: 1200px !important;
-}
-
-li p:last-child {
-  margin-bottom: 12px !important;
-}
-
-html {
-  scroll-behavior: smooth;
-}
diff --git a/tox.ini b/tox.ini
index c249c9e..74f65f8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,7 @@
 # You may add new sections, but any changes made to the following sections will be lost:
 #     * tox
 #     * envlists
+#     * testenv
 #     * testenv:.package
 #     * testenv:py313-dev
 #     * testenv:py313
@@ -35,6 +36,17 @@ test = py38, py39, py310, py311, py312, py313, pypy38, pypy39
 qa = mypy, lint
 cov = py39, coverage
 
+[testenv]
+setenv =
+    PYTHONDEVMODE=1
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+    SETUPTOOLS_USE_DISTUTILS=stdlib
+download = True
+deps = -r{toxinidir}/tests/requirements.txt
+commands =
+    python --version
+    python -m pytest --cov=dict2css -r aR tests/ {posargs}
+
 [testenv:.package]
 setenv =
     PYTHONDEVMODE=1
@@ -203,15 +215,3 @@ package = dict2css
 [pytest]
 addopts = --color yes --durations 25
 timeout = 300
-
-[testenv]
-setenv =
-    PYTHONDEVMODE=1
-    PIP_DISABLE_PIP_VERSION_CHECK=1
-deps = -r{toxinidir}/tests/requirements.txt
-commands =
-    python --version
-    python -m pip uninstall css-parser -y
-    python -m pytest --cov=dict2css -r aR tests/ {posargs}
-    python -m pip install "css-parser>=1.0.6"
-    python -m pytest --cov=dict2css -r aR tests/ --cov-append {posargs}