109 lines
2.4 KiB
Markdown
109 lines
2.4 KiB
Markdown
---
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id: 587d78a7367417b2b2512ae0
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title: Use CSS Animation to Change the Hover State of a Button
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challengeType: 0
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videoUrl: 'https://scrimba.com/c/cg4vZAa'
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---
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## Description
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<section id='description'>
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You can use CSS <code>@keyframes</code> to change the color of a button in its hover state.
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Here's an example of changing the width of an image on hover:
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```html
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<style>
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img:hover {
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animation-name: width;
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animation-duration: 500ms;
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}
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@keyframes width {
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100% {
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width: 40px;
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}
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}
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</style>
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<img src="https://bit.ly/smallgooglelogo" alt="Google's Logo" />
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```
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</section>
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## Instructions
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<section id='instructions'>
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Note that <code>ms</code> stands for milliseconds, where 1000ms is equal to 1s.
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Use CSS <code>@keyframes</code> to change the <code>background-color</code> of the <code>button</code> element so it becomes <code>#4791d0</code> when a user hovers over it. The <code>@keyframes</code> rule should only have an entry for <code>100%</code>.
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: The @keyframes rule should use the <code>animation-name</code> background-color.
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testString: assert(code.match(/@keyframes\s+?background-color\s*?{/g), 'The @keyframes rule should use the <code>animation-name</code> background-color.');
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- text: There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.
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testString: assert(code.match(/100%\s*?{\s*?background-color:\s*?#4791d0;\s*?}/gi), 'There should be one rule under <code>@keyframes</code> that changes the <code>background-color</code> to <code>#4791d0</code> at 100%.');
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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button {
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border-radius: 5px;
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color: white;
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background-color: #0F5897;
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padding: 5px 10px 8px 10px;
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}
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button:hover {
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animation-name: background-color;
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animation-duration: 500ms;
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}
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</style>
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<button>Register</button>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```html
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<style>
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button {
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border-radius: 5px;
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color: white;
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background-color: #0F5897;
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padding: 5px 10px 8px 10px;
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}
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button:hover {
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animation-name: background-color;
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animation-duration: 500ms;
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}
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@keyframes background-color {
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100% {
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background-color: #4791d0;
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}
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}
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</style>
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<button>Register</button>
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```
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</section>
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