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---
id: 5d822fd413a79914d39e98e9
title: Part 33
challengeType: 0
---
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# --description--
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I see some code that can be optimized. Move the `position` and `top` properties and values from `foreground-buildings` to `background-buildings` . Then select both `background-buildings` and `foreground-buildings` there, effectively applying those styles to both of the elements. You can use a comma (`,`) to separate selectors like this: `selector1, selector2` .
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# --hints--
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test-text
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```js
assert(
$('.background-buildings').css('position') === 'absolute' & &
$('.background-buildings').css('top') === '0px' & &
/(\.background-buildings\s*,\s*\.foreground-buildings|\.foreground-buildings\s*,\s*\.background-buildings)/g.test(
code
)
);
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```
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# --seed--
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## --seed-contents--
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```html
<!DOCTYPE html>
< html >
< head >
< title > freeCodeCamp Skyline Project< / title >
< style >
: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;
}
.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;
}
.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%;
}
< / style >
< / 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 >
```
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# --solutions--
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```html
<!DOCTYPE html>
< html >
< head >
< title > freeCodeCamp Skyline Project< / title >
< style >
: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;
}
.background-buildings, .foreground-buildings {
width: 100%;
height: 100%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
position: absolute;
top: 0;
}
.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%;
display: flex;
align-items: flex-end;
justify-content: space-evenly;
}
.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%;
}
< / style >
< / 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 >
```