---
id: 5d822fd413a79914d39e98d2
title: Part 10
challengeType: 0
isHidden: true
---
## 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.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: 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));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```