137 lines
2.9 KiB
Markdown
137 lines
2.9 KiB
Markdown
---
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id: 612ebedec97e096c8bf64999
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title: ステップ 29
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challengeType: 0
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dashedName: step-29
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---
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# --description--
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`@media` クエリ内に `.keys` セレクターを追加し、`width` の値を `318px` に設定してください。
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# --hints--
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`@media` ルールには `.keys` セレクターが必要です。
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```js
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const rules = new __helpers.CSSHelp(document).getRuleListsWithinMedia('(max-width: 768px)');
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const keys = rules?.find(rule => rule.selectorText === '.keys');
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assert(keys);
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```
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新しい `.keys` セレクターには値が `318px` に設定されている `width` が必要です。
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```js
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const rules = new __helpers.CSSHelp(document).getRuleListsWithinMedia('(max-width: 768px)');
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const keys = rules?.find(rule => rule.selectorText === '.keys');
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assert(keys?.style.width === '318px');
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```
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# --seed--
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## --seed-contents--
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<title>Piano</title>
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<link rel="stylesheet" href="./styles.css">
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</head>
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<body>
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<div id="piano">
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<img class="logo" src="https://cdn.freecodecamp.org/platform/universal/fcc_primary.svg" alt="freeCodeCamp Logo" />
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<div class="keys">
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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<div class="key black--key"></div>
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</div>
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</div>
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</body>
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</html>
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```
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```css
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html {
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box-sizing: border-box;
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}
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*, *::before, *::after {
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box-sizing: inherit;
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}
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#piano {
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background-color: #00471b;
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width: 992px;
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height: 290px;
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margin: 80px auto;
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padding: 90px 20px 0 20px;
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position: relative;
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border-radius: 10px;
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}
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.keys {
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background-color: #040404;
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width: 949px;
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height: 180px;
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padding-left: 2px;
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}
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.key {
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background-color: #ffffff;
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position: relative;
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width: 41px;
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height: 175px;
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margin: 2px;
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float: left;
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border-radius: 0 0 3px 3px;
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}
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.key.black--key::after {
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background-color: #1d1e22;
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content: "";
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position: absolute;
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left: -18px;
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width: 32px;
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height: 100px;
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border-radius: 0 0 3px 3px;
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}
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.logo {
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width: 200px;
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position: absolute;
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top: 23px;
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}
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--fcc-editable-region--
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@media (max-width: 768px) {
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#piano {
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width: 358px;
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}
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}
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--fcc-editable-region--
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```
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