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---
id: 5d822fd413a79914d39e9911
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title: Step 73
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challengeType: 0
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dashedName: step-73
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---
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# --description--
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Looks good! On to the foreground buildings! Turn the `.fb1` building into three sections by nesting three new `div` elements within it. Give them the classes of `fb1a` , `fb1b` and `fb1c` , in that order.
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# --hints--
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You should add three `div` elements within `.fb1` .
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```js
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assert.equal(document.querySelector("div.fb1")?.children?.length, 3);
```
You should give the first new `div` a class of `fb1a` .
```js
assert.exists(document.querySelector("div.fb1 > div.fb1a"));
```
You should give the second new `div` a class of `fbab` .
```js
assert.exists(document.querySelector("div.fb1 > div.fb1b"));
```
You should give the third new `div` a class of `fb1c` .
```js
assert.exists(document.querySelector("div.fb1 > div.fb1c"));
```
You should place the new `div` elements in this order `.fb1a + .fb1b + .fb1c` .
```js
assert.exists(document.querySelector("div.fb1a + div.fb1b"));
assert.exists(document.querySelector("div.fb1b + div.fb1c"));
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```
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# --seed--
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## --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 > < / div >
< div > < / div >
< div class = "bb1 building-wrap" >
< 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 building-wrap" >
< div class = "bb4a" > < / div >
< div class = "bb4b" > < / div >
< div class = "bb4c window-wrap" >
< div class = "bb4-window" > < / div >
< div class = "bb4-window" > < / div >
< div class = "bb4-window" > < / div >
< div class = "bb4-window" > < / div >
< / div >
< / div >
< div > < / div >
< div > < / div >
< / div >
< div class = "foreground-buildings" >
< div > < / div >
< div > < / div >
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--fcc-editable-region--
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< div class = "fb1" > < / div >
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--fcc-editable-region--
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< 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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```css
:root {
--building-color1: #aa80ff ;
--building-color2: #66cc99 ;
--building-color3: #cc6699 ;
--building-color4: #538cc6 ;
--window-color1: black;
--window-color2: #8cd9b3 ;
--window-color3: #d98cb3 ;
--window-color4: #8cb3d9 ;
}
* {
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;
}
.building-wrap {
display: flex;
flex-direction: column;
align-items: center;
}
.window-wrap {
display: flex;
align-items: center;
justify-content: space-evenly;
}
/* BACKGROUND BUILDINGS - "bb" stands for "background building" */
.bb1 {
width: 10%;
height: 70%;
}
.bb1a {
width: 70%;
}
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.bb1b {
width: 80%;
}
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.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);
}
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.bb4c {
width: 100%;
height: 85%;
background-color: var(--building-color4);
}
.bb4-window {
width: 18%;
height: 90%;
background-color: var(--window-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);
}
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.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);
}
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```
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