116 lines
2.0 KiB
Markdown
116 lines
2.0 KiB
Markdown
---
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id: bad87fee1348bd9aedf08823
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title: 给元素添加负外边距
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cnpyGs3'
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forumTopicId: 16166
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dashedName: add-a-negative-margin-to-an-element
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---
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# --description--
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元素的 `margin（外边距）` 用来控制元素 `border（边框）` 与其周围元素之间的距离大小。
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如果你把元素的 `margin` 设置为负值，元素会变得占用更多空间。
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# --instructions--
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请将蓝色框的 `margin` 设为负值，跟红色框的一样。
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将蓝色框的 `margin` 设置为 `-15px`，它会让蓝色框填满整个黄色框。
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# --hints--
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class 为 `blue-box` 的元素的 `margin` 应设置为 `-15px`。
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```js
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assert($('.blue-box').css('margin-top') === '-15px');
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```
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# --seed--
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## --seed-contents--
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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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# --solutions--
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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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margin-top: -15px;
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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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