freeCodeCamp/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-variables-by-buil.../5d822fd413a79914d39e98e0.md

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---
id: 5d822fd413a79914d39e98e0
title: Step 24
challengeType: 0
dashedName: step-24
---
# --description--
Crea una nuova variabile sotto le altre, chiamala `--building-color3` e dalle il valore `#cc6699`. Quindi usala come valore di `background-color` della classe `.bb3` e aggiungi un valore di fallback `pink`.
# --hints--
Dovresti definire una nuova variabile di proprietà chiamata `--building-color3`.
```js
assert.exists(new __helpers.CSSHelp(document).isPropertyUsed('--building-color3'));
```
Dovresti dare a `--building-color3` il valore `#cc6699`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1')?.getPropertyValue('--building-color3')?.trim(), '#cc6699');
```
Dovresti impostare la proprietà `background-color` di `.bb3`.
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('.bb3')?.backgroundColor);
```
Dovresti impostare la proprietà `background-color` usando la variabile `--building-color3` e il fallback `pink`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb3')?.backgroundColor.trim(), 'var(--building-color3, pink)');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<title>City Skyline</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="background-buildings">
<div></div>
<div></div>
<div class="bb1">
<div class="bb1a"></div>
<div class="bb1b"></div>
<div class="bb1c"></div>
<div class="bb1d"></div>
</div>
<div class="bb2"></div>
<div class="bb3"></div>
<div></div>
<div class="bb4"></div>
<div></div>
<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%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
--fcc-editable-region--
.bb1 {
width: 10%;
height: 70%;
display: flex;
flex-direction: column;
align-items: center;
--building-color1: #aa80ff;
--building-color2: #66cc99;
}
.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);
}
.bb2 {
width: 10%;
height: 50%;
background-color: var(--building-color2, green);
}
.bb3 {
width: 10%;
height: 55%;
}
--fcc-editable-region--
.bb4 {
width: 11%;
height: 58%;
}
```