---
id: 60b69a66b6ddb80858c5159e
title: Step 40
challengeType: 0
dashedName: step-40
---
# --description--
Use an `id` selector to create a rule for your `black-hat` element. Give it a `width` of `0`, a `height` of `0`, and a `border-style` of `solid`.
# --hints--
You should have a `#black-hat` selector.
```js
assert(new __helpers.CSSHelp(document).getStyle('#black-hat'));
```
Your `#black-hat` selector should have a `width` property set to `0`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#black-hat')?.width === '0px');
```
Your `#black-hat` selector should have a `height` property set to `0`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#black-hat')?.height === '0px');
```
Your `#black-hat` selector should have a `border-style` property set to `solid`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#black-hat')?.borderStyle === 'solid');
```
# --seed--
## --seed-contents--
```html