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---
id: 5d822fd413a79914d39e98d7
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title: Step 15
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challengeType: 0
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dashedName: step-15
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---
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# --description--
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To use a variable, put the variable name in parentheses with `var` in front of them like this: `var(--variable-name)` . Add your variable as the value of the `background-color` property of the `.bb1a` class. Whatever value you gave the variable will be applied to whatever property you use it on. In this case, your variable has the value of `#999` . So `#999` will be used as the value for the `background-color` property.
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# --hints--
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The `background-color` of the `bb1a` element should be set.
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```js
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assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1a')?.backgroundColor)
```
You should use `var(--building-color1)` to set the `background-color` of the `.bb1a` element.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1a')?.backgroundColor.trim(), 'var(--building-color1)');
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```
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# --seed--
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## --seed-contents--
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```html
<!DOCTYPE html>
< html >
< head >
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< title > City Skyline< / title >
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< link href = "styles.css" rel = "stylesheet" type = "text/css" / >
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< / head >
< body >
< div class = "background-buildings" >
< div class = "bb1" >
< div class = "bb1a" > < / div >
< div class = "bb1b" > < / div >
< div class = "bb1c" > < / div >
< div class = "bb1d" > < / div >
< / div >
< / div >
< / body >
< / html >
```
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```css
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
.background-buildings {
width: 100%;
height: 100%;
}
.bb1 {
width: 10%;
height: 70%;
display: flex;
flex-direction: column;
align-items: center;
--building-color1: #999 ;
}
--fcc-editable-region--
.bb1a {
width: 70%;
height: 10%;
}
--fcc-editable-region--
.bb1b {
width: 80%;
height: 10%;
}
.bb1c {
width: 90%;
height: 10%;
}
.bb1d {
width: 100%;
height: 70%;
}
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```
