---
id: 5d822fd413a79914d39e98d8
title: Part 16
challengeType: 0
isHidden: true
---
## Description
It's that simple. Use the same variable as the `background-color` of the `bb1b`, `bb1c`, and `bb1d` classes to fill in the rest of the building.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const bb1bStyle = code.match(/\.bb1b\s*{[\s\S]+?[^}]}/g)[0]; const bb1cStyle = code.match(/\.bb1c\s*{[\s\S]+?[^}]}/g)[0]; const bb1dStyle = code.match(/\.bb1d\s*{[\s\S]+?[^}]}/g)[0]; assert(/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1bStyle) && /background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1cStyle) && /background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(bb1dStyle));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```