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freeCodeCamp/curriculum/challenges/chinese/01-responsive-web-design/css-flexbox/use-display-flex-to-position-two-boxes.md
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---
id: 587d78ab367417b2b2512af0
title: '使用 display: flex 定位两个盒子'
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVaDAv/cgz3QS7'
forumTopicId: 301105
dashedName: use-display-flex-to-position-two-boxes
---
# --description--
这节我们会使用不同的挑战方式来学习如何使用 CSS 更灵活地布局元素。 首先我们会通过一个挑战来解释原理然后通过操作一个简单的推文组件来应用弹性盒子flexbox
只要在一个元素的 CSS 中添加 `display: flex;`,就可以使用其它 flex 属性来构建响应式页面了。
# --instructions--
请为 `#box-container` 添加 `display` 属性,并设置其属性值为 `flex`
# --hints--
`#box-container` 应具有 `display`属性,其属性值应为 `flex`
```js
assert($('#box-container').css('display') == 'flex');
```
# --seed--
## --seed-contents--
```html
<style>
#box-container {
height: 500px;
}
#box-1 {
background-color: dodgerblue;
width: 50%;
height: 50%;
}
#box-2 {
background-color: orangered;
width: 50%;
height: 50%;
}
</style>
<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>
</div>
```
# --solutions--
```html
<style>
#box-container {
height: 500px;
display: flex;
}
#box-1 {
background-color: dodgerblue;
width: 50%;
height: 50%;
}
#box-2 {
background-color: orangered;
width: 50%;
height: 50%;
}
</style>
<div id="box-container">
<div id="box-1"></div>
<div id="box-2"></div>
</div>
```