---
id: 619d05c54dabca0b10058235
title: Step 54
challengeType: 0
dashedName: step-54
---
# --description--
So far, the `.face` and `.chin` elements have the same `background-color`.
Create a custom CSS property called `--penguin-face`, and set it to `white`.
# --hints--
You should use the `:root` selector.
```js
assert.match(code, /:root\s*\{/);
```
You should give `:root` a `--penguin-face` property.
```js
assert.notEmpty(new __helpers.CSSHelp(document).getStyle(':root')?.getPropertyValue('--penguin-face'));
```
You should give `:root` a `--penguin-face` of `--fcc-expected--`, but found `--fcc-actual--`.
```js
assert.equal(new __helpers.CSSHelp(document).getStyle(':root')?.getPropVal('--penguin-face', true), 'white');
```
# --seed--
## --seed-contents--
```html