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---
id: 612e96fc87fe8e44f69f7ec5
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title: Step 13
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challengeType: 0
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dashedName: step-13
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---
# --description--
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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` .
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# --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
<!DOCTYPE html>
< html >
< head >
< meta charset = "UTF-8" / >
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< title > Piano< / title >
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< meta name = "viewport" content = "width=device-width, initial-scale=1.0" / >
< link rel = "stylesheet" href = "./styles.css" >
< / head >
< body >
< div id = "piano" >
< div class = "keys" >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< div class = "key black--key" > < / div >
< / div >
< / div >
< / body >
< / html >
```
```css
html {
box-sizing: border-box;
}
*, *::before, * ::after {
box-sizing: inherit;
}
#piano {
background-color: #00471b ;
width: 992px;
height: 290px;
margin: 80px auto;
}
--fcc-editable-region--
--fcc-editable-region--
```
