---
id: 5d822fd413a79914d39e9918
title: Part 80
challengeType: 0
isHidden: true
---
## Description
You're going to use some more border tricks for top section. Add a `border-bottom` with a value of `7vh solid var(--building-color4)` to `fb1a`. This will put a `7vh` height border on the bottom. But since the element has zero size, it only shows up as a 2px wide line from the 1px border that is on all the elements.
## Instructions
## Tests
```yml
tests:
- text: test-text
testString: const fb1a = code.match(/\.fb1a\s*{[\s\S]+?[^}]}/g)[0]; assert(/border-bottom\s*:\s*7vh\s+solid\s+var\(\s*--building-color4\s*\)\s*(;|})/g.test(fb1a));
```
## Challenge Seed
```html
freeCodeCamp Skyline Project
```