---
id: 5d822fd413a79914d39e98e3
title: Part 27
challengeType: 0
---
## Description
Create another variable named `--building-color4` and give it a value of `#538cc6`, make sure it's in the `:root` selector this time. Then use it to fill in the last building.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const rootStyle = code.match(/:root\s*{[\s\S]+?[^}]}/g)[0]; const bb4style = code.match(/\.bb4\s*{[\s\S]+?[^}]}/g)[0]; assert(/--building-color4\s*:\s*#538cc6\s*(;|\s*})/g.test(rootStyle) && /background-color\s*:\s*var\(\s*--building-color4\s*\)\s*(;|\s*})/g.test(bb4style));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```