---
id: 5d822fd413a79914d39e98ce
title: Part 6
challengeType: 0
dashedName: part-6
---
# --description--
Also add a `box-sizing` of `border-box` to everything. This will make it so the border you added doesn't add any size to your elements.
# --hints--
You should use the `box-sizing` property.
```js
assert(new __helpers.CSSHelp(document).isPropertyUsed('box-sizing'));
```
You should make use of the existing `*` selector.
```js
// Two selectors create two CSSStyleRule objects
assert.equal(new __helpers.CSSHelp(document).getStyleDeclarations('*').length, 1);
```
All elements should have a `box-sizing` of `border-box`.
```js
const astStyles = new __helpers.CSSHelp(document).getStyle('*');
assert.equal(astStyles.boxSizing, 'border-box');
```
# --seed--
## --seed-contents--
```html
freeCodeCamp Skyline Project
```
```css
--fcc-editable-region--
* {
border: 1px solid black;
}
--fcc-editable-region--
```