---
id: 5d822fd413a79914d39e98d8
title: Part 16
challengeType: 0
dashedName: part-16
---
# --description--
It's that simple. Use the same variable as the `background-color` of the `bb1b`, `bb1c`, and `bb1d` classes to fill in the rest of the building.
# --hints--
test-text
```js
const bb1bStyle = code.match(/\.bb1b\s*{[\s\S]+?[^}]}/g)[0];
const bb1cStyle = code.match(/\.bb1c\s*{[\s\S]+?[^}]}/g)[0];
const bb1dStyle = code.match(/\.bb1d\s*{[\s\S]+?[^}]}/g)[0];
assert(
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(
bb1bStyle
) &&
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(
bb1cStyle
) &&
/background-color\s*:\s*var\(\s*--building-color1\s*\)\s*(;|\s*})/g.test(
bb1dStyle
)
);
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
# --solutions--
```html
freeCodeCamp Skyline Project
```