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---
id: 5d822fd413a79914d39e98dc
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title: Step 20
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challengeType: 0
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dashedName: step-20
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---
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# --description--
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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.
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# --hints--
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You should add a `display` of `flex` to the `background-buildings` class.
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```js
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assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.display, 'flex');
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```
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You should add an `align-items` of `flex-end` to the `background-buildings` class.
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```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.alignItems, 'flex-end');
```
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You should add a `justify-content` of `space-evenly` to the `background-buildings` class.
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```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.background-buildings')?.justifyContent, 'space-evenly');
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```
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# --seed--
## --seed-contents--
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```html
<!DOCTYPE html>
< html >
< head >
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< title > City Skyline< / title >
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< link href = "styles.css" rel = "stylesheet" type = "text/css" / >
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< / 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 >
```
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```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%;
}
```
