87 lines
1.8 KiB
Markdown
87 lines
1.8 KiB
Markdown
---
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id: bad87fee1348bd9aedf08823
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title: Add a Negative Margin to an Element
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challengeType: 0
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guideUrl: 'https://chinese.freecodecamp.org/guide/certificates/add-a-negative-margin-to-an-element'
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videoUrl: ''
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localeTitle: 向元素添加负边距
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---
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## Description
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<section id="description">元素的<code>margin</code>控制元素<code>border</code>与周围元素之间的空间量。如果将元素的<code>margin</code>设置为负值，则元素将变大。 </section>
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## Instructions
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<section id="instructions">尝试将<code>margin</code>设置为负值，如红色框的值。将蓝色框的<code>margin</code>更改为<code>-15px</code> ，因此它会填充其周围黄色框的整个水平宽度。 </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: 你的<code>blue-box</code>类应该给出<code>-15px</code>的<code>margin</code>元素。
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testString: 'assert($(".blue-box").css("margin-top") === "-15px", "Your <code>blue-box</code> class should give elements <code>-15px</code> of <code>margin</code>.");'
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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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.injected-text {
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margin-bottom: -25px;
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text-align: center;
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}
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.box {
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border-style: solid;
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border-color: black;
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border-width: 5px;
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text-align: center;
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}
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.yellow-box {
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background-color: yellow;
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padding: 10px;
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}
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.red-box {
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background-color: crimson;
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color: #fff;
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padding: 20px;
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margin: -15px;
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}
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.blue-box {
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background-color: blue;
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color: #fff;
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padding: 20px;
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margin: 20px;
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}
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</style>
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<div class="box yellow-box">
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<h5 class="box red-box">padding</h5>
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<h5 class="box blue-box">padding</h5>
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</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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