Stopwatch solution by serg121192 · Pull Request #4224 · mate-academy/layout_stop-watch

serg121192 · 2026-08-19T21:25:18Z

DEMO LINK
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

Review Summary

I’m requesting changes because critical CSS needed to render and animate the stopwatch is missing, which blocks the core functionality. While the HTML structure and keyframes exist, there are no rules for the .stopwatch block to set 80vmin size, a 1vmin dotted #000 circular border, or positioning to center within its container (see src/index.html). The hands are not styled or animated: .stopwatch__seconds-hand must be 38vmin by 1.5vmin, green #2c8000, start at the top, and use animation: rotation 60s linear infinite; (override to 10s with .stopwatch--speed-up). The .stopwatch__minutes-hand must be 20vmin by 3vmin, blue #0700ff, start at the top, and use animation: rotation 60min steps(60) infinite; (override to 10min with the modifier). The center circle .stopwatch__center (5vmin, #f6a603) is also missing. Please add these styles in src/styles/main.scss (as imported by index.scss), including correct transform-origin so hands rotate from the center and start at 12 o’clock. Once these styles and modifier overrides are implemented, the stopwatch should meet all requirements.

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mateacademy-ai-mentor · 2026-08-19T21:29:15Z

@@ -0,0 +1,14 @@
+@mixin hand($top, $left, $height, $width, $color) {
+  position: absolute;
+  top: $top;


The main.scss file containing the actual stopwatch styling (sizes, colors, positions, animations) is not provided. This file is imported in index.scss and is essential to verify the implementation meets all requirements.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

@@ -0,0 +1,14 @@
+@mixin hand($top, $left, $height, $width, $color) {


The variables.scss file with CSS custom properties (like $hands-transform-origin) is not provided. This file is imported in index.scss and is used by the mixins.

You wrong. This file is provided with all needed variables and you can find it at the follow path: src/styles/utils/variables.scss. mixins.scss at the same path.

You wrong. This file is provided with all needed variables and you can find it at the follow path: src/styles/utils/variables.scss. mixins.scss at the same path.

@mateacademy-ai-mentor, check this, please.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

  </head>
  <body>
-    <h1>Stop watch</h1>
+    <div class="stopwatch stopwatch--speed-up">


The HTML includes the required element with class stopwatch and the stopwatch--speed-up modifier as required by the task. However, there are no CSS rules in the provided files that define the stopwatch block, its size (80vmin), dotted border, centered placement (within its own container), the hands' dimensions, colors, starting top position, or the animations (duration, timing-function, steps for minutes). Please add/implement these styles in main or another imported stylesheet so the stopwatch visuals and animations meet the task requirements.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

  </head>
  <body>
-    <h1>Stop watch</h1>
+    <div class="stopwatch stopwatch--speed-up">


There is no rule that makes the stopwatch element exactly 80vmin by 80vmin, with a 1vmin dotted round border #000. Add CSS like width: 80vmin; height: 80vmin; border: 1vmin dotted #000; border-radius: 50%; for the .stopwatch block.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

  <body>
-    <h1>Stop watch</h1>
+    <div class="stopwatch stopwatch--speed-up">
+      <div class="stopwatch__seconds-hand"></div>


The seconds hand must be 38vmin long and 1.5vmin wide in color #2c8000, start from the center pointing to the top, animate smoothly (linear) with a duration of 60s (and 10s when .stopwatch--speed-up modifier is present). No corresponding CSS is present — implement .stopwatch__seconds-hand rules and apply animation: rotation 60s linear infinite; (override to 10s in the modifier).

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

@@ -0,0 +1,8 @@
+@keyframes rotation {


Keyframes are present (rotation) but the requirements demand keyframes implemented using from/to + transform with rotate property — your @keyframes rotation meets that. However, no animation properties are applied to .stopwatch__seconds-hand or .stopwatch__minutes-hand in the provided files; add animation: rotation 60s linear infinite; for seconds and animation: rotation 60min steps(60) infinite; for minutes (with appropriate transform-origin and starting rotation so hands start at top).

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

+@keyframes rotation {
+  from {
+    transform: rotate(0deg);
+  }


Ensure the seconds hand uses a linear timing function (no acceleration/deceleration) and that the minutes hand uses steps(60) for discrete movement. Also implement the .stopwatch--speed-up modifier to change durations to 10s and 10min respectively. These declarations are not present in the supplied styles and must be added.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

@@ -1,3 +1,15 @@
+@import './utils/variables';


Keyframes are defined using from/to + transform: rotate(), which matches the requirement for keyframes. But this alone is not enough — the actual CSS rules that apply these keyframes to the second and minute hands (with correct durations, timing-function and steps for minutes) are missing.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

+@import 'main';
+@import 'animations';
+
 body {


There are no styles present that set the stopwatch container size to 80vmin, add a 1vmin dotted round border #000, or center it (the body uses flex centering which is fine, but the stopwatch element itself lacks the required sizing and border). Add CSS for .stopwatch to set width/height to 80vmin, border-radius: 50%, border: 1vmin dotted #000, and ensure it's centered.

mateacademy-ai-mentor · 2026-08-19T21:29:15Z

@@ -1,3 +1,15 @@
+@import './utils/variables';
+@import './utils/mixins';
+@import 'main';


The project currently imports main in index.scss but that file isn't provided here. Ensure main.scss (or similarly named partial) contains the missing styles for the stopwatch block; if it does not exist you must create it and include the required CSS.

mateacademy-ai-mentor

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mateacademy-ai-mentor

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mateacademy-ai-mentor

Sorry, the pull request review was unsuccessful for the following reasons:

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mateacademy-ai-mentor

Sorry, the pull request review was unsuccessful for the following reasons:

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Anton-Kuchmasov

Well done!

Stopwatch solution

44d1775

mateacademy-ai-mentor suggested changes Aug 19, 2026

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serg121192 requested a review from mateacademy-ai-mentor August 19, 2026 21:47

mateacademy-ai-mentor reviewed Aug 19, 2026

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mateacademy-ai-mentor reviewed Aug 20, 2026

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Anton-Kuchmasov approved these changes Aug 20, 2026

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		@@ -0,0 +1,14 @@
		@mixin hand($top, $left, $height, $width, $color) {

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serg121192 commented Aug 19, 2026

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