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---
id: 5d822fd413a79914d39e98d7
title: Part 15
challengeType: 0
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dashedName: part-15
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---
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# --description--
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To use a variable, just put the variable name in parenthesis 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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test-text
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```js
const bb1aStyle = code.match(/\.bb1a\s*{[\s\S]+?[^}]}/g)[0];
assert(
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(
bb1aStyle
)
);
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```
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# --seed--
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## --seed-contents--
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```html
<!DOCTYPE html>
< html >
< head >
< title > freeCodeCamp Skyline Project< / title >
< style >
* {
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 ;
}
.bb1a {
width: 70%;
height: 10%;
}
.bb1b {
width: 80%;
height: 10%;
}
.bb1c {
width: 90%;
height: 10%;
}
.bb1d {
width: 100%;
height: 70%;
}
< / style >
< / 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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# --solutions--
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```html
<!DOCTYPE html>
< html >
< head >
< title > freeCodeCamp Skyline Project< / title >
< style >
* {
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 ;
}
.bb1a {
width: 70%;
height: 10%;
background-color: var(--building-color1);
}
.bb1b {
width: 80%;
height: 10%;
}
.bb1c {
width: 90%;
height: 10%;
}
.bb1d {
width: 100%;
height: 70%;
}
< / style >
< / 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 >
```
