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---
id: 5d822fd413a79914d39e9908
title: Part 64
challengeType: 0
---
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# --description--
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Remove the `background-color` property and value from `bb4` and add it to the three new sections; `bb4a` , `bb4b` , and `bb4c` , so only the sections are filled.
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# --hints--
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test-text
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```js
const bb4 = code.match(/\.bb4\s*{[\s\S]+?[^}]}/g)[0];
assert(
!/background-color/g.test(bb4) & &
$('.bb4a').css('background-color') === 'rgb(83, 140, 198)' & &
$('.bb4b').css('background-color') === 'rgb(83, 140, 198)' & &
$('.bb4c').css('background-color') === 'rgb(83, 140, 198)'
);
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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 ;
--window-color1: black;
--window-color2: #8cd9b3 ;
--window-color3: #d98cb3 ;
}
* {
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;
}
/* BACKGROUND BUILDINGS - "bb" stands for "background building" */
.bb1 {
width: 10%;
height: 70%;
display: flex;
flex-direction: column;
align-items: center;
}
.bb1a {
width: 70%;
}
.bb1b {
width: 80%;
}
.bb1c {
width: 90%;
}
.bb1d {
width: 100%;
height: 70%;
background: linear-gradient(
var(--building-color1) 50%,
var(--window-color1)
);
}
.bb1-window {
height: 10%;
background: linear-gradient(
var(--building-color1),
var(--window-color1)
);
}
.bb2 {
width: 10%;
height: 50%;
}
.bb2a {
border-bottom: 5vh solid var(--building-color2);
border-left: 5vw solid transparent;
border-right: 5vw solid transparent;
}
.bb2b {
width: 100%;
height: 100%;
background: repeating-linear-gradient(
var(--building-color2),
var(--building-color2) 6%,
var(--window-color2) 6%,
var(--window-color2) 9%
);
}
.bb3 {
width: 10%;
height: 55%;
background: repeating-linear-gradient(
90deg,
var(--building-color3),
var(--building-color3),
var(--window-color3) 15%
);
}
.bb4 {
width: 11%;
height: 58%;
background-color: var(--building-color4);
}
.bb4a {
width: 3%;
height: 10%;
}
.bb4b {
width: 80%;
height: 5%;
}
.bb4c {
width: 100%;
height: 85%;
}
/* FOREGROUND BUILDINGS - "fb" stands for "foreground building" */
.fb1 {
width: 10%;
height: 60%;
background-color: var(--building-color4);
}
.fb2 {
width: 10%;
height: 40%;
background-color: var(--building-color3);
}
.fb3 {
width: 10%;
height: 35%;
background-color: var(--building-color1);
}
.fb4 {
width: 8%;
height: 45%;
background-color: var(--building-color1);
position: relative;
left: 10%;
}
.fb5 {
width: 10%;
height: 33%;
background-color: var(--building-color2);
position: relative;
right: 10%;
}
.fb6 {
width: 9%;
height: 38%;
background-color: var(--building-color3);
}
< / style >
< / head >
< body >
< div class = "background-buildings" >
< div > < / div >
< div > < / div >
< div class = "bb1" >
< div class = "bb1a bb1-window" > < / div >
< div class = "bb1b bb1-window" > < / div >
< div class = "bb1c bb1-window" > < / div >
< div class = "bb1d" > < / div >
< / div >
< div class = "bb2" >
< div class = "bb2a" > < / div >
< div class = "bb2b" > < / div >
< / div >
< div class = "bb3" > < / div >
< div > < / div >
< div class = "bb4" >
< div class = "bb4a" > < / div >
< div class = "bb4b" > < / div >
< div class = "bb4c" > < / div >
< / div >
< div > < / div >
< div > < / div >
< / div >
< div class = "foreground-buildings" >
< div > < / div >
< div > < / div >
< div class = "fb1" > < / div >
< div class = "fb2" > < / div >
< div > < / div >
< div class = "fb3" > < / div >
< div class = "fb4" > < / div >
< div class = "fb5" > < / div >
< div class = "fb6" > < / div >
< div > < / div >
< div > < / 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 ;
--window-color1: black;
--window-color2: #8cd9b3 ;
--window-color3: #d98cb3 ;
}
* {
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;
}
/* BACKGROUND BUILDINGS - "bb" stands for "background building" */
.bb1 {
width: 10%;
height: 70%;
display: flex;
flex-direction: column;
align-items: center;
}
.bb1a {
width: 70%;
}
.bb1b {
width: 80%;
}
.bb1c {
width: 90%;
}
.bb1d {
width: 100%;
height: 70%;
background: linear-gradient(
var(--building-color1) 50%,
var(--window-color1)
);
}
.bb1-window {
height: 10%;
background: linear-gradient(
var(--building-color1),
var(--window-color1)
);
}
.bb2 {
width: 10%;
height: 50%;
}
.bb2a {
border-bottom: 5vh solid var(--building-color2);
border-left: 5vw solid transparent;
border-right: 5vw solid transparent;
}
.bb2b {
width: 100%;
height: 100%;
background: repeating-linear-gradient(
var(--building-color2),
var(--building-color2) 6%,
var(--window-color2) 6%,
var(--window-color2) 9%
);
}
.bb3 {
width: 10%;
height: 55%;
background: repeating-linear-gradient(
90deg,
var(--building-color3),
var(--building-color3),
var(--window-color3) 15%
);
}
.bb4 {
width: 11%;
height: 58%;
}
.bb4a {
width: 3%;
height: 10%;
background-color: var(--building-color4);
}
.bb4b {
width: 80%;
height: 5%;
background-color: var(--building-color4);
}
.bb4c {
width: 100%;
height: 85%;
background-color: var(--building-color4);
}
/* FOREGROUND BUILDINGS - "fb" stands for "foreground building" */
.fb1 {
width: 10%;
height: 60%;
background-color: var(--building-color4);
}
.fb2 {
width: 10%;
height: 40%;
background-color: var(--building-color3);
}
.fb3 {
width: 10%;
height: 35%;
background-color: var(--building-color1);
}
.fb4 {
width: 8%;
height: 45%;
background-color: var(--building-color1);
position: relative;
left: 10%;
}
.fb5 {
width: 10%;
height: 33%;
background-color: var(--building-color2);
position: relative;
right: 10%;
}
.fb6 {
width: 9%;
height: 38%;
background-color: var(--building-color3);
}
< / style >
< / head >
< body >
< div class = "background-buildings" >
< div > < / div >
< div > < / div >
< div class = "bb1" >
< div class = "bb1a bb1-window" > < / div >
< div class = "bb1b bb1-window" > < / div >
< div class = "bb1c bb1-window" > < / div >
< div class = "bb1d" > < / div >
< / div >
< div class = "bb2" >
< div class = "bb2a" > < / div >
< div class = "bb2b" > < / div >
< / div >
< div class = "bb3" > < / div >
< div > < / div >
< div class = "bb4" >
< div class = "bb4a" > < / div >
< div class = "bb4b" > < / div >
< div class = "bb4c" > < / div >
< / div >
< div > < / div >
< div > < / div >
< / div >
< div class = "foreground-buildings" >
< div > < / div >
< div > < / div >
< div class = "fb1" > < / div >
< div class = "fb2" > < / div >
< div > < / div >
< div class = "fb3" > < / div >
< div class = "fb4" > < / div >
< div class = "fb5" > < / div >
< div class = "fb6" > < / div >
< div > < / div >
< div > < / div >
< / div >
< / body >
< / html >
```