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---
id: 5d822fd413a79914d39e98d2
title: Part 10
challengeType: 0
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dashedName: part-10
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---
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# --description--
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Nest a `div` with a class of `bb1` in the background buildings container. Give it a `width` of `10%` and `height` of `70%` . "bb" stands for "background building", this will be your first building.
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# --hints--
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test-text
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```js
const bb1 = code.match(/\.bb1\s*{[\s\S]+?[^}]}/g)[0];
assert(
$('.background-buildings')[0].contains($('div.bb1')[0]) & &
/width\s*:\s*10%\s*(;|})/g.test(bb1) &&
/height\s*:\s*70%\s*(;|})/g.test(bb1)
);
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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 >
* {
border: 1px solid black;
box-sizing: border-box;
}
body {
height: 100vh;
margin: 0;
overflow: hidden;
}
.background-buildings {
width: 100%;
height: 100%;
}
< / style >
< / head >
< body >
< div class = "background-buildings" > < / div >
< / body >
< / html >
```
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# --solutions--
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```html
<!DOCTYPE html>
< html >
< head >
< title > freeCodeCamp Skyline Project< / title >
< style >
* {
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%;
}
< / style >
< / head >
< body >
< div class = "background-buildings" >
< div class = "bb1" > < / div >
< / div >
< / body >
< / html >
```