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---
id: 5d822fd413a79914d39e98db
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title: Step 19
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challengeType: 0
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dashedName: step-19
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---
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# --description--
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Give the new buildings `width` and `height` properties of: `10%` and `50%` for `.bb2` , `10%` and `55%` for `.bb3` , and `11%` and `58%` for `.bb4` . You will be using almost all percent based units and some flexbox for this project, so everything will be completely responsive.
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# --hints--
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You should give `.bb2` a `width` of `10%` .
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```js
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assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2')?.width, '10%');
```
You should give `.bb2` a `height` of `50%` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb2')?.height, '50%');
```
You should give `.bb3` a `width` of `10%` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb3')?.width, '10%');
```
You should give `.bb3` a `height` of `55%` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb3')?.height, '55%');
```
You should give `.bb4` a `width` of `11%` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb4')?.width, '11%');
```
You should give `.bb4` a `height` of `58%` .
```js
assert.equal(new __helpers.CSSHelp(document).getStyle('.bb4')?.height, '58%');
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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 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 >
< / body >
< / html >
```
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```css
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
.background-buildings {
width: 100%;
height: 100%;
}
.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);
}
--fcc-editable-region--
--fcc-editable-region--
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```
