116 lines
2.0 KiB
Markdown
116 lines
2.0 KiB
Markdown
---
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id: bad87fee1348bd9aedf08823
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title: 給元素添加負外邊距
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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（外邊距）` 用來控制元素 `border（邊框）` 與其周圍元素之間的距離大小。
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如果你把元素的 `margin` 設置爲負值，元素會變得佔用更多空間。
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# --instructions--
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請將藍色框的 `margin` 設爲負值，跟紅色框的一樣。
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將藍色框的 `margin` 設置爲 `-15px`，它會讓藍色框填滿整個黃色框。
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# --hints--
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class 爲 `blue-box` 的元素的 `margin` 應設置爲 `-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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