---
id: 587d78ae367417b2b2512afd
title: Use the flex-basis Property to Set the Initial Size of an Item
challengeType: 0
videoUrl: 'https://scrimba.com/p/pVaDAv/c3d9nCa'
---
## Description
The flex-basis
property specifies the initial size of the item before CSS makes adjustments with flex-shrink
or flex-grow
.
The units used by the flex-basis
property are the same as other size properties (px
, em
, %
, etc.). The value auto
sizes items based on the content.
## Instructions
Set the initial size of the boxes using flex-basis
. Add the CSS property flex-basis
to both #box-1
and #box-2
. Give #box-1
a value of 10em
and #box-2
a value of 20em
.
## Tests
```yml
tests:
- text: The #box-1
element should have a flex-basis
property.
testString: assert($('#box-1').css('flex-basis') != 'auto', 'The #box-1
element should have a flex-basis
property.');
- text: The #box-1
element should have a flex-basis
value of 10em
.
testString: assert(code.match(/#box-1\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?10em;/g), 'The #box-1
element should have a flex-basis
value of 10em
.');
- text: The #box-2
element should have the flex-basis
property.
testString: assert($('#box-2').css('flex-basis') != 'auto', 'The #box-2
element should have the flex-basis
property.');
- text: The #box-2
element should have a flex-basis
value of 20em
.
testString: assert(code.match(/#box-2\s*?{\s*?.*?\s*?.*?\s*?flex-basis:\s*?20em;/g), 'The #box-2
element should have a flex-basis
value of 20em
.');
```
## Challenge Seed
## Solution