curriculum/challenges/english/blocks/learn-css-variables-by-building-a-city-skyline/5d822fd413a79914d39e98d7.md
To use a variable, put the variable name in parentheses with var in front of them like this: var(--variable-name). Whatever value you gave the variable will be applied to whatever property you use it on.
Add the variable --building-color1 you created in the previous step as the value of the background-color property of the .bb1a class.
The background-color of the .bb1a element should be set.
assert.exists(new __helpers.CSSHelp(document).getStyle('.bb1a')?.backgroundColor)
You should use var(--building-color1) to set the background-color of the .bb1a element.
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb1a')?.getPropVal('background-color', true), 'var(--building-color1)');
<!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>
* {
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%;
}