---
id: 5d822fd413a79914d39e9910
title: Part 72
challengeType: 0
---
## Description
Add the new `window-wrap` class to the `bb4c` element.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: assert($(".bb4c.window-wrap").length === 1);
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```