---
id: 5d822fd413a79914d39e9923
title: Part 90
challengeType: 0
dashedName: part-90
---
# --description--
Remove the `background-color` property and value from `fb3` and add them to `fb3a` and `fb3b`.
# --hints--
test-text
```js
const fb3 = code.match(/\.fb3\s*{[\s\S]+?[^}]}/g)[0];
const fb3a = code.match(/\.fb3a\s*{[\s\S]+?[^}]}/g)[0];
const fb3b = code.match(/\.fb3b\s*{[\s\S]+?[^}]}/g)[0];
assert(
!/background-color/g.test(fb3) &&
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|})/g.test(
fb3a
) &&
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|})/g.test(fb3b)
);
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
# --solutions--
```html
freeCodeCamp Skyline Project
```