72 lines
1.6 KiB
Markdown
72 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: ''
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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">当元素定位为重叠时，默认情况下，HTML标记中稍后出现的元素将显示在其他元素的顶部。但是， <code>z-index</code>属性可以指定元素彼此堆叠的顺序。它必须是整数（即整数而不是小数），并且元素的<code>z-index</code>属性的较高值会使其在堆栈中的移动值高于具有较低值的值。 </section>
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## Instructions
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<section id="instructions">将<code>z-index</code>属性添加到类名为<code>first</code> （红色矩形）的元素中，并将其设置为值2，以便覆盖另一个元素（蓝色矩形）。 </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: 具有类<code>first</code>的元素的<code>z-index</code>值应为2。
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testString: 'assert($(".first").css("z-index") == "2", "The element with class <code>first</code> should have a <code>z-index</code> value of 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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```js
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// solution required
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```
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</section>
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