---
id: 5d822fd413a79914d39e9901
title: Part 57
challengeType: 0
isHidden: true
---
## Description
Remove the `margin` and `border-top` properties and values from `bb2a` to turn it into a triangle for the top of the building.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const bb2a = code.match(/\.bb2a\s*{[\s\S]+?[^}]}/g)[0]; assert(!/margin/g.test(bb2a) && !/border-top/g.test(bb2a));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```