freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-16.md

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---
id: 5d822fd413a79914d39e98d8
title: Part 16
challengeType: 0
isBeta: true
---
## Description
<section id='description'>
It's that simple. Use the same variable as the `background-color` of the `bb1b`, `bb1c`, and `bb1d` classes to fill in the rest of the building.
</section>
## Instructions
<section id='instructions'>
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: test-text
testString: const bb1bStyle = code.match(/\.bb1b\s*{[\s\S]+?[^}]}/g)[0]; const bb1cStyle = code.match(/\.bb1c\s*{[\s\S]+?[^}]}/g)[0]; const bb1dStyle = code.match(/\.bb1d\s*{[\s\S]+?[^}]}/g)[0]; assert(/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1bStyle) && /background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1cStyle) && /background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1dStyle));
```
</section>
## Challenge Seed
<section id='challengeSeed'>
<div id='html-seed'>
```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>
```
</div>
</section>
## Solution
<section id='solution'>
```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%;
background-color: var(--building-color1);
}
.bb1c {
width: 90%;
height: 10%;
background-color: var(--building-color1);
}
.bb1d {
width: 100%;
height: 70%;
background-color: var(--building-color1);
}
</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>
```
</section>