---
id: 5d822fd413a79914d39e98ef
title: Part 39
challengeType: 0
isHidden: true
---
## Description
Create a new variable in `:root` called `--window-color1` and give it a value of `black`. This will be a secondary color for the purple buildings.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const rootStyle = code.match(/:root\s*{[\s\S]+?[^}]}/g)[0]; assert(/--window-color1\s*:\s*black\s*(;|})/g.test(rootStyle));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```