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freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-variables-skyline/step-020.md
Nicholas Carrigan (he/him) b36cdbafd1 chore: rename "part" to "step" (#43934)
* chore: rename part to step

* chore: update metas

* chore: more renaming

* chore: update tooling

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* chore(tools): title testing
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---
id: 5d822fd413a79914d39e98dc
title: Step 20
challengeType: 0
dashedName: step-20
---
# --description--
The buildings are stacked on top of each other and running off the screen. Let's fix that. Add the properties `display: flex;`, `align-items: flex-end;`, and `justify-content: space-evenly;` to the `background-buildings` class. This will use flexbox again to evenly space the buildings across the bottom of the element.
# --hints--
You should add a `display` of `flex` to the `background-buildings` class.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.display, 'flex');
```
You should add an `align-items` of `flex-end` to the `background-buildings` class.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.alignItems, 'flex-end');
```
You should add a `justify-content` of `space-evenly` to the `background-buildings` class.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.justifyContent, 'space-evenly');
```
# --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>
<div class="bb2"></div>
<div class="bb3"></div>
<div class="bb4"></div>
</div>
</body>
</html>
```
```css
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
--fcc-editable-region--
.background-buildings {
width: 100%;
height: 100%;
}
--fcc-editable-region--
.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);
}
.bb2 {
width: 10%;
height: 50%;
}
.bb3 {
width: 10%;
height: 55%;
}
.bb4 {
width: 11%;
height: 58%;
}
```