---
id: 6141019eadec6d2c6c6f007b
title: Step 25
challengeType: 0
dashedName: step-25
---
# --description--
You can use `@keyframes` rules to control more than just the transformation of an element. In the `0%` selector of your `@keyframes cabins`, set the `background-color` to `yellow`.
# --hints--
Your `0%` selector should have a `background-color` property set to `yellow`.
```js
assert(new __helpers.CSSHelp(document).getCSSRules('keyframes')?.[1]?.cssRules?.[0]?.style?.backgroundColor === 'yellow');
```
# --seed--
## --seed-contents--
```html