freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-display-flex-to-positio...

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---
id: 587d78ab367417b2b2512af0
title: 'Use display: flex to Position Two Boxes'
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVaDAv/cgz3QS7'
---
## Description
<section id='description'>
This section uses alternating challenge styles to show how to use CSS to position elements in a flexible way. First, a challenge will explain theory, then a practical challenge using a simple tweet component will apply the flexbox concept.
Placing the CSS property <code>display: flex;</code> on an element allows you to use other flex properties to build a responsive page.
</section>
## Instructions
<section id='instructions'>
Add the CSS property <code>display</code> to <code>#box-container</code> and set its value to flex.
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: <code>#box-container</code> should have the <code>display</code> property set to a value of flex.
testString: assert($('#box-container').css('display') == 'flex', '<code>#box-container</code> should have the <code>display</code> property set to a value of flex.');
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```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>
```
</div>
</section>
## Solution
<section id='solution'>
```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>
```
</section>