freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/basic-css/use-css-variables-to-change-several-elements-at-once.md

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---
id: 5a9d725e424fe3d0e10cad10
challengeType: 0
videoUrl: 'https://scrimba.com/c/c6bDECm'
forumTopicId: 301093
2020-10-01 17:54:21 +02:00
title: 使用 CSS 变量一次更改多个元素
---
## Description
<section id='description'>
<dfn>CSS 变量</dfn>是一种仅更改一个值,来一次性更改多个 CSS 样式属性的强大方法。
按照下面指示的来做,我们只需要改变三个值,多个样式将会同时被修改。
</section>
## Instructions
<section id='instructions'>
<code>penguin</code>class 里,将<code>black</code>改为<code>gray</code><code>gray</code>改为<code>white</code><code>yellow</code>改为<code>orange</code>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: '<code>penguin</code> class 声明的<code>--penguin-skin</code>变量的值应为<code>gray</code>。'
testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-skin\s*?:\s*?gray\s*?;[\s\S]*}/gi));
- text: '<code>penguin</code> class 声明的<code>--penguin-belly</code>变量的值应为<code>white</code>。'
testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi));
- text: '<code>penguin</code> class 声明的<code>--penguin-beak</code>变量的值应为<code>orange</code>。'
testString: assert(code.match(/.penguin\s*?{[\s\S]*--penguin-beak\s*?:\s*?orange\s*?;[\s\S]*}/gi));
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```html
<style>
.penguin {
/* change code below */
--penguin-skin: black;
--penguin-belly: gray;
--penguin-beak: yellow;
/* change code above */
position: relative;
margin: auto;
display: block;
margin-top: 5%;
width: 300px;
height: 300px;
}
.penguin-top {
top: 10%;
left: 25%;
background: var(--penguin-skin, gray);
width: 50%;
height: 45%;
border-radius: 70% 70% 60% 60%;
}
.penguin-bottom {
top: 40%;
left: 23.5%;
background: var(--penguin-skin, gray);
width: 53%;
height: 45%;
border-radius: 70% 70% 100% 100%;
}
.right-hand {
top: 0%;
left: -5%;
background: var(--penguin-skin, gray);
width: 30%;
height: 60%;
border-radius: 30% 30% 120% 30%;
transform: rotate(45deg);
z-index: -1;
}
.left-hand {
top: 0%;
left: 75%;
background: var(--penguin-skin, gray);
width: 30%;
height: 60%;
border-radius: 30% 30% 30% 120%;
transform: rotate(-45deg);
z-index: -1;
}
.right-cheek {
top: 15%;
left: 35%;
background: var(--penguin-belly, white);
width: 60%;
height: 70%;
border-radius: 70% 70% 60% 60%;
}
.left-cheek {
top: 15%;
left: 5%;
background: var(--penguin-belly, white);
width: 60%;
height: 70%;
border-radius: 70% 70% 60% 60%;
}
.belly {
top: 60%;
left: 2.5%;
background: var(--penguin-belly, white);
width: 95%;
height: 100%;
border-radius: 120% 120% 100% 100%;
}
.right-feet {
top: 85%;
left: 60%;
background: var(--penguin-beak, orange);
width: 15%;
height: 30%;
border-radius: 50% 50% 50% 50%;
transform: rotate(-80deg);
z-index: -2222;
}
.left-feet {
top: 85%;
left: 25%;
background: var(--penguin-beak, orange);
width: 15%;
height: 30%;
border-radius: 50% 50% 50% 50%;
transform: rotate(80deg);
z-index: -2222;
}
.right-eye {
top: 45%;
left: 60%;
background: black;
width: 15%;
height: 17%;
border-radius: 50%;
}
.left-eye {
top: 45%;
left: 25%;
background: black;
width: 15%;
height: 17%;
border-radius: 50%;
}
.sparkle {
top: 25%;
left: 15%;
background: white;
width: 35%;
height: 35%;
border-radius: 50%;
}
.blush-right {
top: 65%;
left: 15%;
background: pink;
width: 15%;
height: 10%;
border-radius: 50%;
}
.blush-left {
top: 65%;
left: 70%;
background: pink;
width: 15%;
height: 10%;
border-radius: 50%;
}
.beak-top {
top: 60%;
left: 40%;
background: var(--penguin-beak, orange);
width: 20%;
height: 10%;
border-radius: 50%;
}
.beak-bottom {
top: 65%;
left: 42%;
background: var(--penguin-beak, orange);
width: 16%;
height: 10%;
border-radius: 50%;
}
body {
background:#c6faf1;
}
.penguin * {
position: absolute;
}
</style>
<div class="penguin">
<div class="penguin-bottom">
<div class="right-hand"></div>
<div class="left-hand"></div>
<div class="right-feet"></div>
<div class="left-feet"></div>
</div>
<div class="penguin-top">
<div class="right-cheek"></div>
<div class="left-cheek"></div>
<div class="belly"></div>
<div class="right-eye">
<div class="sparkle"></div>
</div>
<div class="left-eye">
<div class="sparkle"></div>
</div>
<div class="blush-right"></div>
<div class="blush-left"></div>
<div class="beak-top"></div>
<div class="beak-bottom"></div>
</div>
</div>
```
</div>
</section>
## Solution
<section id='solution'>
```js
// solution required
```
</section>