---
id: 587d78a7367417b2b2512ae0
title: Use CSS Animation to Change the Hover State of a Button
challengeType: 0
videoUrl: 'https://scrimba.com/c/cg4vZAa'
---
## Description
You can use CSS @keyframes
to change the color of a button in its hover state.
Here's an example of changing the width of an image on hover:
```html
```
## Instructions
Note that ms
stands for milliseconds, where 1000ms is equal to 1s.
Use CSS @keyframes
to change the background-color
of the button
element so it becomes #4791d0
when a user hovers over it. The @keyframes
rule should only have an entry for 100%
.
## Tests
```yml
tests:
- text: The @keyframes rule should use the animation-name
background-color.
testString: assert(code.match(/@keyframes\s+?background-color\s*?{/g), 'The @keyframes rule should use the animation-name
background-color.');
- text: There should be one rule under @keyframes
that changes the background-color
to #4791d0
at 100%.
testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi), 'There should be one rule under @keyframes
that changes the background-color
to #4791d0
at 100%.');
```
## Challenge Seed
## Solution