---
id: 612e96fc87fe8e44f69f7ec5
title: Step 13
challengeType: 0
dashedName: step-13
---
# --description--
Time to style the keys. Below the `#piano` rule, target the `.keys` element with a `class` selector. Give the new rule a `background-color` property of `#040404`, a `width` property of `949px` and a `height` property of `180px`.
# --hints--
You should have a `.keys` selector.
```js
assert(new __helpers.CSSHelp(document).getStyle('.keys'));
```
Your `.keys` selector should have a `background-color` property set to `#040404`.
```js
assert(new __helpers.CSSHelp(document).getStyle('.keys')?.backgroundColor === 'rgb(4, 4, 4)');
```
Your `.keys` selector should have the `width` property set to `949px`.
```js
assert(new __helpers.CSSHelp(document).getStyle('.keys')?.width === '949px');
```
Your `.keys` selector should have a `height` property set to `180px`.
```js
assert(new __helpers.CSSHelp(document).getStyle('.keys')?.height === '180px');
```
# --seed--
## --seed-contents--
```html
Piano