freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-023.md

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---
id: 5d822fd413a79914d39e98df
title: Part 23
challengeType: 0
dashedName: part-23
---
# --description--
Hmm, I'm not sure why that didn't work. You can add a fallback value to a variable by putting it as the second value of where you use the variable like this: `var(--variable-name, fallback-value)`. The property will use the fallback value when there's a problem with the variable. Add a fallback value of `green` to the `background-color` of `bb2`.
# --hints--
test-text
```js
const bb2style = code.match(/\.bb2\s*{[\s\S]+?[^}]}/g)[0];
assert(
/background-color\s*:\s*var\(\s*--building-color2\s*,\s*green\s*\)\s*(;|\s*})/g.test(
bb2style
)
);
```
# --seed--
## --seed-contents--
```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%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
.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);
}
.bb3 {
width: 10%;
height: 55%;
}
.bb4 {
width: 11%;
height: 58%;
}
</style>
</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>
```
# --solutions--
```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%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
.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%;
}
.bb4 {
width: 11%;
height: 58%;
}
</style>
</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>
```