---
id: 5d822fd413a79914d39e990e
title: Part 70
challengeType: 0
---
## Description
Give the `bb4-window` class a `width` of `18%`, a `height` of `90%`, and add your `--window-color4` variable as the `background-color`.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const bb4Window = code.match(/\.bb4-window\s*{[\s\S]+?[^}]}/g)[0]; assert(/width\s*:\s*18%\s*(;|})/g.test(bb4Window) && /height\s*:\s*90%\s*(;|})/g.test(bb4Window) && /background-color\s*:\s*var\(\s*--window-color4\s*\)\s*(;|})/g.test(bb4Window));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```