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---
id: 5d822fd413a79914d39e98dd
title: Step 21
challengeType: 0
dashedName: step-21
---
# --description--
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Gli edifici sono troppo distanziati. Comprimili aggiungendo due elementi `div` vuoti in cima all'elemento `.background-buildings` , due alla fine e uno tra `.bb3` e `.bb4` . Verranno aggiunti come elementi uniformemente distanziati, spostando efficacemente gli edifici più vicino al centro.
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# --hints--
Dovresti aggiungere due nuovi elementi `div` prima dell'elemento `.bb1` .
```js
const bBuildings = document.querySelector('.background-buildings')?.children;
assert(![...bBuildings?.[0]?.classList]?.includes('bb1'));
assert(![...bBuildings?.[1]?.classList]?.includes('bb1'));
```
Dovresti aggiungere un nuovo elemento `div` tra l'elemento `.bb3` e `.bb4` .
```js
assert(document.querySelector('.bb3')?.nextElementSibling === document.querySelector('.bb4')?.previousElementSibling);
```
Dovresti aggiungere due nuovi elementi `div` dopo l'elemento `.bb4` .
```js
const bb4 = document.querySelector('.bb4');
assert.exists(bb4?.nextElementSibling);
assert.exists(bb4?.nextElementSibling?.nextElementSibling);
```
Dovresti aggiungere 5 nuovi elementi `div` .
```js
assert.equal(document.querySelectorAll('div')?.length, 14);
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
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< html lang = "en" >
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< head >
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< meta charset = "UTF-8" >
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< title > City Skyline< / title >
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< link href = "styles.css" rel = "stylesheet" / >
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< / head >
< body >
--fcc-editable-region--
< 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 >
--fcc-editable-region--
< / body >
< / html >
```
```css
* {
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 ;
}
.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%;
}
```
