add solution#4162
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karolina0372
commented
Jun 16, 2026
- Keyframes implemented using from/to + transform with rotate property
- Stopwatch is centered and has the correct arrows size
- All Typical Mistakes from the BEM lesson theory are checked.
- Code follows all the Code Style Rules ❗️
mateacademy-ai-mentor
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Review Summary
I am requesting changes because one core requirement is not yet met: the stopwatch hands do not visually start at the top of the dial. The task explicitly states that the initial position of both hands must be at the top, but with the current transform-origin: left center and rotation from -90deg to 270deg, the hands extend horizontally from the center instead of vertically toward the top. This is a functional/behavioral issue, not just cosmetic, because it breaks the specified initial state of the animation.
To fix this, you need to adjust the transform logic so the hands point straight up at 0deg (for example, by changing transform-origin to use the bottom center of each hand, or by introducing an inner element for the visual hand and rotating that), while still rotating around the stopwatch center. Focus on updating the SCSS for .stopwatch__seconds and .stopwatch__minutes so that with the current HTML structure (no extra wrappers), the visible rectangles start at the top and then rotate correctly. Aside from this, your implementation of sizes, colors, border, centering, animations (durations, linear, steps(60)), and the stopwatch--speed-up modifier looks solid and matches the description well. Once the starting position of the hands is corrected, your solution will fully satisfy the task requirements.
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Footnotes
| <body> | ||
| <h1>Stop watch</h1> | ||
| <div class="stopwatch stopwatch--speed-up"> | ||
| <div class="stopwatch__minutes"></div> |
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According to the description, "The starting position of the hands should be at the top." With the current SCSS (using transform-origin: left center and rotation around a horizontal axis from the center), these hands will appear horizontal, not pointing to the top of the circle. You should adjust the hand positioning/transform logic so that, with this markup, the hands are visually pointing up at the start of the animation.
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Review Summary
I am requesting changes because one core functional requirement is still not met: both hands do not visually start at the top (12 o’clock) of the stopwatch. In src/styles/index.scss, your hands are centered with left: 50%, top: 50%, transform-origin: left center, and animated from transform: translateY(-50%) rotate(-90deg) to translateY(-50%) rotate(270deg), which makes them extend horizontally to the right at the initial frame instead of pointing upward. The task explicitly requires “The starting position of the hands should be at the top,” and this was highlighted in the previous review as still needing correction, so this is a critical blocker for acceptance.
To fix this, adjust the geometry and transform origin so that the base of each hand is at the center of the stopwatch and the visible rectangle points straight up at the from keyframe, while still rotating around the center. A common pattern is something like transform-origin: center bottom (or similar, depending on how you size/position the hand) and then animating transform: rotate(0deg) to transform: rotate(360deg) so the hand starts at 12 o’clock and rotates correctly. All other requirements look solid: sizes, colors, centering, infinite animations, correct durations, linear for seconds, steps(60) for minutes, and the stopwatch--speed-up BEM modifier are implemented correctly. Once you adjust the transform origin/animation so both hands start at the top visually, your solution should be ready for acceptance.
✨ Please rate this review in the Platform's notification center1. I will be grateful for your feedback! ✨
Important
Fix the issues, commit the changes, and then re-request my review using the Re-request review button2 in the Reviewers tab.
Tip
If you have any comments about this review, please leave a message in the Add a comment section below and mention me with the @mateacademy-ai-mentor tag3.
I will read your message during my next review of your pull request. Please do not reply directly to my comments, as that feature is not supported yet.
Caution
Do not close the pull request until the review is complete. Closing it early can lead to unexpected behavior and disrupt the review process.
Footnotes
| border: 1vmin dotted #000; | ||
| border-radius: 50%; | ||
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| &__seconds { |
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The task explicitly requires: "The starting position of the hands should be at the top." With the current combination of transform-origin: left center on the elements and the rotate(-90deg) / rotate(270deg) in the keyframes, the hands are horizontally aligned (pointing to the right) at the start, not vertically toward the top. This violates the core requirement and the previous review note about fixing the initial position of both hands.
| @keyframes rotate { | ||
| from { | ||
| transform-origin: left center; | ||
| transform: translateY(-50%) rotate(-90deg); | ||
| } | ||
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| to { | ||
| transform-origin: left center; | ||
| transform: translateY(-50%) rotate(270deg); |
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This animation uses from/to + transform with rotate, which is good, but the chosen transforms (translateY(-50%) rotate(-90deg) to translateY(-50%) rotate(270deg)) combined with transform-origin: left center keep the hands horizontal. You need to change the origin and/or transform so that at from the visible hand points straight up at the top of the stopwatch while still rotating around the center.
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Review Summary
I am approving your solution as an educational override so you can continue progressing while you practice refining the animation details.
You did a strong job meeting most of the visual and behavioral requirements: correct sizes and colors of the stopwatch and hands, proper centering, infinite CSS-only animations, correct durations (60s for seconds, 60min with steps(60) for minutes), and a well-structured BEM modifier (.stopwatch--speed-up) that correctly speeds up both hands. The main remaining issue is that both the seconds and minutes hands do not visually start at the top (12 o’clock): with left: 50%, top: 50%, transform-origin: 0 50%, and keyframes using translateY(-50%) rotate(-90deg), the hands begin horizontally from the center instead of pointing straight up, which conflicts with the requirement that the starting position be at the top and with [CHECKLIST ITEM #1] about proper keyframe setup. To improve this, keep the base of each hand at the center of the stopwatch and adjust the geometry and transform-origin (for example, a vertical rectangle with transform-origin: center bottom) so your keyframes can simply go from transform: rotate(0deg) to transform: rotate(360deg), ensuring the hand points to 12 o’clock at the initial frame while rotating around the center.
Overall, your structure, animation durations, and modifier logic are solid; refining the initial orientation and rotation pivot of the hands will bring your solution fully in line with the spec and is a great next step in mastering CSS transforms and animations.
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Footnotes
| &__seconds { | ||
| @include hand(38vmin, 1.5vmin, #2c8000); | ||
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| transform-origin: 0 50%; | ||
| transform: translateY(-50%) rotate(-90deg); | ||
| animation: rotate 60s linear infinite; |
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This still violates the requirement "The starting position of the hands should be at the top" and the previous review’s correction: with left: 50%, top: 50%, transform-origin: 0 50%, and the current keyframes, the hands initially extend horizontally from the center instead of pointing to 12 o’clock. You need to adjust the hands’ geometry and transform-origin so the base is at the center of the stopwatch and the rectangle points straight up at the initial frame while rotating around that center.
| &__minutes { | ||
| @include hand(20vmin, 3vmin, #0700ff); | ||
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| transform-origin: 0 50%; | ||
| transform: translateY(-50%) rotate(-90deg); | ||
| animation: rotate 3600s steps(60) infinite; |
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This shares the same issue as the seconds hand: the minutes hand’s initial transform and transform-origin make it start horizontally rather than at the top, which conflicts with the requirement "The starting position of the hands should be at the top." Consider using a pattern like transform-origin: center bottom and animating from rotate(0deg) to rotate(360deg) so it starts at 12 o’clock and rotates correctly.
| @keyframes rotate { | ||
| from { | ||
| transform-origin: left center; | ||
| transform: translateY(-50%) rotate(-90deg); | ||
| } | ||
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| to { | ||
| transform-origin: left center; | ||
| transform: translateY(-50%) rotate(270deg); |
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This keyframes definition violates checklist item #1: "Keyframes implemented using from/to + transform with rotate property" and the requirement that the hand starts at the top. You are animating translateY(-50%) rotate(-90deg) → translateY(-50%) rotate(270deg), which makes the initial position horizontal at 9 o’clock instead of 12 o’clock. Rework the keyframes so they animate only the rotation (e.g. transform: rotate(0deg) to transform: rotate(360deg)) with a fixed transform-origin that keeps the base in the center and the hand pointing up at the start.