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freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/use-css-animation-to-change-the-hover-state-of-a-button.md
James Geer 3207ea04e7 fix(curriculum): Css fix for issue #43517: Example css code does not demonstrate hover animation (#43524)
* fix question example code for id: 587d78a7367417b2b2512ae0

* Revert "fix question example code for id: 587d78a7367417b2b2512ae0"

This reverts commit c99edf8609.

* modifying only the english version of button hover example

* change to keep css looking consistent
2021-09-22 16:22:11 +02:00

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---
id: 587d78a7367417b2b2512ae0
title: Use CSS Animation to Change the Hover State of a Button
challengeType: 0
videoUrl: 'https://scrimba.com/c/cg4vZAa'
forumTopicId: 301073
dashedName: use-css-animation-to-change-the-hover-state-of-a-button
---
# --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
<style>
img {
width: 30px;
}
img:hover {
animation-name: width;
animation-duration: 500ms;
}
@keyframes width {
100% {
width: 40px;
}
}
</style>
<img src="https://cdn.freecodecamp.org/curriculum/applied-visual-design/google-logo.png" alt="Google's Logo" />
```
# --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%`.
# --hints--
The @keyframes rule should use the `animation-name` background-color.
```js
assert(code.match(/@keyframes\s+?background-color\s*?{/g));
```
There should be one rule under `@keyframes` that changes the `background-color` to `#4791d0` at 100%.
```js
assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi));
```
# --seed--
## --seed-contents--
```html
<style>
button {
border-radius: 5px;
color: white;
background-color: #0F5897;
padding: 5px 10px 8px 10px;
}
button:hover {
animation-name: background-color;
animation-duration: 500ms;
}
</style>
<button>Register</button>
```
# --solutions--
```html
<style>
button {
border-radius: 5px;
color: white;
background-color: #0F5897;
padding: 5px 10px 8px 10px;
}
button:hover {
animation-name: background-color;
animation-duration: 500ms;
}
@keyframes background-color {
100% {
background-color: #4791d0;
}
}
</style>
<button>Register</button>
```