77 lines
1.6 KiB
Markdown
77 lines
1.6 KiB
Markdown
---
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id: 587d78a3367417b2b2512acf
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title: Change the Position of Overlapping Elements with the z-index Property
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cM94aHk'
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forumTopicId: 301046
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localeTitle: 使用 z-index 属性更改重叠元素的位置
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---
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## Description
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<section id='description'>
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当一些元素重叠时，在 HTML 里后出现的元素会默认显示在更早出现的元素的上面。你可以使用 <code>z-index</code> 属性指定元素的堆叠次序。<code>z-index</code> 的取值是整数，数值大的元素优先于数值小的元素显示。
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</section>
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## Instructions
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<section id='instructions'>
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给 class 为 <code>first</code> 的元素（红色的方块）添加 <code>z-index</code> 属性并赋值为 2，使它显示在蓝色方块的上方。
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 'class 为 <code>first</code> 的元素的 <code>z-index</code> 值应该为 2。'
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testString: assert($('.first').css('z-index') == '2', 'class 为 <code>first</code> 的元素的 <code>z-index</code> 值应该为 2。');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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div {
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width: 60%;
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height: 200px;
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margin-top: 20px;
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}
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.first {
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background-color: red;
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position: absolute;
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}
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.second {
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background-color: blue;
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position: absolute;
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left: 40px;
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top: 50px;
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z-index: 1;
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}
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</style>
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<div class="first"></div>
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<div class="second"></div>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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// solution required
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```
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</section>
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