freeCodeCamp/curriculum/challenges/portuguese/14-responsive-web-design-22/learn-css-variables-by-buil.../5d822fd413a79914d39e98d8.md

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---
id: 5d822fd413a79914d39e98d8
title: Passo 16
challengeType: 0
dashedName: step-16
---
# --description--
Use a mesma variável que você usou como valor de `background-color` nas classes `.bb1b`, `.bb1c` e `.bb1d` para preencher o restante do edifício.
# --hints--
A `background-color` do elemento `bb1b` deve ser definida.
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1b')?.backgroundColor)
```
Você deve usar `var(--building-color1)` para definir a `background-color` do elemento `.bb1b`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1b')?.getPropVal('background-color', true), 'var(--building-color1)');
```
A `background-color` do elemento `bb1c` deve ser definida.
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1c')?.backgroundColor)
```
Você deve usar `var(--building-color1)` para definir a `background-color` do elemento `.bb1c`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1c')?.getPropVal('background-color', true), 'var(--building-color1)');
```
A `background-color` do elemento `bb1d` deve ser definida.
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1d')?.backgroundColor)
```
Você deve usar `var(--building-color1)` para definir a `background-color` do elemento `.bb1d`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1d')?.getPropVal('background-color', true), 'var(--building-color1)');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>City Skyline</title>
<link href="styles.css" rel="stylesheet" />
</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>
```
```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;
}
.bb1a {
width: 70%;
height: 10%;
background-color: var(--building-color1);
}
--fcc-editable-region--
.bb1b {
width: 80%;
height: 10%;
}
.bb1c {
width: 90%;
height: 10%;
}
.bb1d {
width: 100%;
height: 70%;
}
--fcc-editable-region--
```