---
id: 5d822fd413a79914d39e98d2
title: Part 10
challengeType: 0
dashedName: part-10
---
# --description--
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.
# --hints--
test-text
```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)
);
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
# --solutions--
```html
freeCodeCamp Skyline Project
```