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---
id: 5d822fd413a79914d39e98e9
title: Step 33
challengeType: 0
dashedName: step-33
---
# --description--
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Dovresti ottimizzare il codice. Sposta le proprietà e i valori `position` e `top` da `.foreground-buildings` a `.background-buildings` . Quindi seleziona sia `.background-buildings` che `.foreground-buildings` , applicando efficacemente gli stili a entrambi gli elementi. Puoi utilizzare una virgola (`,`) per separare i selettori in questo modo: `selettore1, selettore2` .
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# --hints--
Non dovresti rimuovere la dichiarazione `.foreground-buildings` .
```js
assert.exists(new __helpers.CSSHelp(document).getStyle('.foreground-buildings'));
```
Dovresti rimuovere la proprietà `position` da `.foreground-buildings` .
```js
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('.foreground-buildings')?.position);
```
Dovresti rimuovere la proprietà `top` da `.foreground-buildings` .
```js
assert.isEmpty(new __helpers.CSSHelp(document).getStyle('.foreground-buildings')?.top);
```
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Dovresti aggiungere la proprietà `position` con il valore `absolute` a `.background-buildings, .foreground-buildings` .
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```js
function eitherOr() {
const a = new __helpers.CSSHelp(document)
return a.getStyle('.background-buildings, .foreground-buildings') ?? a.getStyle('.foreground-buildings, .background-buildings');
}
assert.equal(eitherOr()?.position, 'absolute');
```
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Dovresti aggiungere la proprietà `top` con il valore `0` a `.background-buildings, .foreground-buildings` .
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```js
function eitherOr() {
const a = new __helpers.CSSHelp(document)
return a.getStyle('.background-buildings, .foreground-buildings') ?? a.getStyle('.foreground-buildings, .background-buildings');
}
assert.equal(eitherOr()?.top, '0px');
```
Dovresti usare una virgola per utilizzare entrambi i selettori `.foreground-buildings` e `.background-buildings` nella stessa dichiarazione.
```js
function eitherOr() {
const a = new __helpers.CSSHelp(document)
return a.getStyle('.background-buildings, .foreground-buildings') ?? a.getStyle('.foreground-buildings, .background-buildings');
}
assert.exists(eitherOr());
```
# --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 >
< 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 >
< div class = "foreground-buildings" >
< div class = "fb1" > < / div >
< div class = "fb2" > < / div >
< div class = "fb3" > < / div >
< div class = "fb4" > < / div >
< div class = "fb5" > < / div >
< div class = "fb6" > < / div >
< / div >
< / body >
< / html >
```
```css
:root {
--building-color1: #aa80ff ;
--building-color2: #66cc99 ;
--building-color3: #cc6699 ;
--building-color4: #538cc6 ;
}
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
--fcc-editable-region--
.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;
}
.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%;
background-color: var(--building-color3);
}
.bb4 {
width: 11%;
height: 58%;
background-color: var(--building-color4);
}
.foreground-buildings {
width: 100%;
height: 100%;
position: absolute;
top: 0;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
--fcc-editable-region--
.fb1 {
width: 10%;
height: 60%;
}
.fb2 {
width: 10%;
height: 40%;
}
.fb3 {
width: 10%;
height: 35%;
}
.fb4 {
width: 8%;
height: 45%;
}
.fb5 {
width: 10%;
height: 33%;
}
.fb6 {
width: 9%;
height: 38%;
}
```
