freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/part-018.md

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---
id: 5d822fd413a79914d39e98da
title: Part 18
challengeType: 0
dashedName: part-18
---
# --description--
Your first building looks pretty good now. Let's make some more! Nest three new `div` elements in the `background-buildings` container and give them the classes of `bb2`, `bb3`, and `bb4` in that order. These will be three more buildings for the background.
# --hints--
You should create a `div` with a class of `bb2`.
```js
assert.exists(document.querySelector('div.bb2'));
```
You should create a `div` with a class of `bb3`.
```js
assert.exists(document.querySelector('div.bb3'));
```
You should create a `div` with a class of `bb4`.
```js
assert.exists(document.querySelector('div.bb4'));
```
You should create 3 new `div` elements.
```js
assert.equal(document.querySelectorAll('div')?.length, 9);
```
You should place these `div` elements within the `.background-buildings` element.
```js
assert.equal(document.querySelector('div.background-buildings')?.children?.length, 4);
```
You should place the elements in the correct order.
```js
function __t(a, b) {
return [...document.querySelector(a)?.nextElementSibling?.classList]?.includes(b);
}
assert(__t('div.bb1','bb2') && __t('div.bb2','bb3') && __t('div.bb3','bb4'));
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<title>freeCodeCamp Skyline Project</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
</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>
--fcc-editable-region--
--fcc-editable-region--
</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: #aa80ff;
}
.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);
}
```