freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/applied-visual-design/add-a-box-shadow-to-a-card-...

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---
id: 587d781b367417b2b2512abe
title: 给卡片元素添加 box-shadow
challengeType: 0
videoUrl: 'https://scrimba.com/c/cvVZdUd'
forumTopicId: 301031
dashedName: add-a-box-shadow-to-a-card-like-element
---
# --description--
`box-shadow` 属性用来给元素添加阴影,该属性值是由逗号分隔的一个或多个阴影列表。
`box-shadow` 属性的阴影依次由下面这些值描述:
<ul>
<li><code>offset-x</code> 阴影的水平偏移量;</li>
<li><code>offset-y</code> 阴影的垂直偏移量;</li>
<li><code>blur-radius</code> 模糊半径;</li>
<li><code>spread-radius</code> 阴影扩展半径;</li>
<li><code>color</code></li>
</ul>
其中 `blur-radius``spread-radius` 是可选的。
可以通过逗号分隔每个 `box-shadow` 元素的属性来添加多个 box-shadow。
如下为添加了模糊效果的例子,它使用了透明度较高的黑色作为阴影:
```css
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
```
# --instructions--
元素现在有一个 `thumbnail` id。 在这个选择器中,使用上面的示例 CSS 值在卡片上加一个 `box-shadow`
# --hints--
应该给 id 为 `thumbnail` 的元素添加 `box-shadow` 属性。
```js
assert(code.match(/#thumbnail\s*?{\s*?box-shadow/g));
```
`box-shadow` 属性值应该是题目说明中指定的 CSS 值。
```js
assert(
code.match(
/box-shadow:\s*?0\s+?10px\s+?20px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.19\)\s*?,\s*?0\s+?6px\s+?6px\s+?rgba\(\s*?0\s*?,\s*?0\s*?,\s*?0\s*?,\s*?0?\.23\)/gi
)
);
```
# --seed--
## --seed-contents--
```html
<style>
h4 {
text-align: center;
background-color: rgba(45, 45, 45, 0.1);
padding: 10px;
font-size: 27px;
}
p {
text-align: justify;
}
.links {
text-align: left;
color: black;
}
.fullCard {
width: 245px;
border: 1px solid #ccc;
border-radius: 5px;
margin: 10px 5px;
padding: 4px;
}
.cardContent {
padding: 10px;
}
.cardText {
margin-bottom: 30px;
}
</style>
<div class="fullCard" id="thumbnail">
<div class="cardContent">
<div class="cardText">
<h4>Alphabet</h4>
<hr>
<p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
</div>
<div class="cardLinks">
<a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
<a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
</div>
</div>
</div>
```
# --solutions--
```html
<style>
h4 {
text-align: center;
background-color: rgba(45, 45, 45, 0.1);
padding: 10px;
font-size: 27px;
}
p {
text-align: justify;
}
.links {
text-align: left;
color: black;
}
#thumbnail {
box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}
.fullCard {
width: 245px;
border: 1px solid #ccc;
border-radius: 5px;
margin: 10px 5px;
padding: 4px;
}
.cardContent {
padding: 10px;
}
.cardText {
margin-bottom: 30px;
}
</style>
<div class="fullCard" id="thumbnail">
<div class="cardContent">
<div class="cardText">
<h4>Alphabet</h4>
<hr>
<p><em>Google was founded by Larry Page and Sergey Brin while they were <u>Ph.D. students</u> at <strong>Stanford University</strong>.</em></p>
</div>
<div class="cardLinks">
<a href="https://en.wikipedia.org/wiki/Larry_Page" target="_blank" class="links">Larry Page</a><br><br>
<a href="https://en.wikipedia.org/wiki/Sergey_Brin" target="_blank" class="links">Sergey Brin</a>
</div>
</div>
</div>
```