style.css

html, body, body * { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

html { font-size: 15px; }
body {
  font: 1rem/1.618 sans-serif;
  background: #efefef;
}

.todoapp {
  max-width: 95%;
	margin: 0 auto;
}

.todoapp input::placeholder {
  color: grey;
  opacity: 1;
}
.todoapp input::-webkit-placeholder {
  color: grey;
  opacity: 1;
}

body .todoapp h1 { font-size: 2rem; }

.header {
	text-align: center;
}

.main {
  justify-content: flex-start;
  align-items: flex-start;
  flex-wrap: wrap;
}

.main > div {
  width: 23%; position: relative;
  margin: 1rem auto; padding: 0 1rem 1.6rem;
  color: #000; 
	background-color: #fff;
  box-shadow: 0 3px 5px 1px rgba(0, 0, 0, 0.1);
  border-radius: 3px;
	display: inline-block;
	vertical-align: top;
	text-align: left;
	margin: 1%;
	min-width: 300px;
}

.new-todo,
.edit {
  width: 100%;
  font-size: 16px;
}

button { border: none; }

input {
  border: 0.1em solid #aaa; border-radius: 0.2em;
  padding: 0.5em 1em; margin: 0.5em 0;
  background: #fff;
}

.list_name {
		margin-top: 0.5em;
    font-weight: normal;
    font-size: 2em;
    margin-bottom: 0.1em;
}

.todo-count { display: none; }

.button {
  border-radius: 0.2em;
  padding: 0.5em 1em; margin: 0.5em;
  background: #eee;
  cursor: pointer; color: #fff;
}

.button_add_todo_list {
  background-color: #5cb85c;
}

.button_remove_todo_list {
    position: absolute;
    top: 0.1rem;
    right: 0.5rem;
    background: none;
    color: #7B7B7B;
    font-size: 2em;
    padding: 0;
    margin: 0;
}

/* -- */

.filters {
	margin: 0;
	padding: 0;
	list-style: none;
	position: absolute;
	right: 0;
	left: 0;
}

.filters li {
	display: inline;
}

.filters li a {
	color: inherit;
	margin: 3px;
	padding: 3px 7px;
	text-decoration: none;
	border: 1px solid transparent;
	border-radius: 3px;
}

.filters li a:hover {
	border-color: rgba(175, 47, 47, 0.1);
}

.filters li a.selected {
	border-color: rgba(175, 47, 47, 0.2);
}

.todo-list {
	margin: 0;
	padding: 0;
	list-style: none;
}

.todo-list li {
	position: relative;
	font-size: 24px;
	border-bottom: 1px solid #ededed;
}

.todo-list li:last-child {
	border-bottom: none;
}

.todo-list li.editing {
	border-bottom: none;
	padding: 0;
}

.todo-list li.editing .edit {
	display: block;
	padding: 12px 16px;
}

.todo-list li.editing .view {
	display: none;
}

.todo-list li .toggle {
	text-align: center;
	width: 40px;
	/* auto, since non-WebKit browsers doesn't support input styling */
	height: 40px;
	padding: 0;
	position: absolute;
	top: 0;
	bottom: 0;
	margin: auto 0;
	border: none; /* Mobile Safari */
	-webkit-appearance: none;
	appearance: none;
	background: none;
}

.todo-list li .toggle:after {
	content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#666" stroke-width="3"/></svg>');
}

.todo-list li .toggle:checked:after {
	content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="50" fill="none" stroke="#777" stroke-width="3"/><path fill="#5dc2af" d="M72 25L42 71 27 56l-4 4 20 20 34-52z"/></svg>');
}

.todo-list li label {
	word-break: break-all;
	padding: 15px 60px 15px 15px;
	margin-left: 45px;
	display: block;
	line-height: 1.2;
	transition: color 0.4s;
}

.todo-list li.completed label {
	color: #d9d9d9;
	text-decoration: line-through;
}

.todo-list li .destroy {
	display: none;
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	width: 40px;
	height: 40px;
	margin: auto 0;
	font-size: 30px;
	color: #cc9a9a;
	margin-bottom: 11px;
	transition: color 0.2s ease-out;
	background: none;
}

.todo-list li .destroy:hover {
	color: #af5b5e;
}

.todo-list li .destroy:after {
	content: '×';
}

.todo-list li:hover .destroy {
	display: block;
}

.todo-list li .edit {
	display: none;
}

.todo-list li.editing:last-child {
	margin-bottom: -1px;
}

.footer {
	color: #777;
	padding: 10px 15px;
	height: 20px;
	text-align: center;
	border-top: 1px solid #e6e6e6;
}

.list_add_todo {
	display: inline-block;
}

.sync-status {
	text-align: center;
	color: #aaa;
}