---
id: 5d822fd413a79914d39e98ef
title: Part 39
challengeType: 0
dashedName: part-39
---
# --description--
Create a new variable in `:root` called `--window-color1` and give it a value of `black`. This will be a secondary color for the purple buildings.
# --hints--
You should create a new variable in `:root` called `--window-color1`.
```js
assert(new __helpers.CSSHelp(document).isPropertyUsed('--window-color1'));
```
You should give the property variable `--window-color1` a value of `black`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle(':root')?.getPropertyValue('--window-color1').trim(), 'black');
```
# --seed--
## --seed-contents--
```html