---
id: 5d822fd413a79914d39e992b
title: Part 98
challengeType: 0
dashedName: part-98
---
# --description--
Add your `--building-color1` variable as value of the `background-color` property of `fb4b`. Then, remove the `background-color` from `fb4`.
# --hints--
test-text
```js
const fb4 = code.match(/\.fb4\s*{[\s\S]+?[^}]}/g)[0];
const fb4b = code.match(/\.fb4b\s*{[\s\S]+?[^}]}/g)[0];
assert(
!/background-color/g.test(fb4) &&
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|})/g.test(fb4b)
);
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
# --solutions--
```html
freeCodeCamp Skyline Project
```