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freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-box-model/part-020.md
Nicholas Carrigan (he/him) a563b3b4e4 feat(curriculum): CSS Box Model project (#42182)
* feat(curriculum): add initial steps

Add the initial step files for this project.

* feat(curriculum): write test texts

Add some test text (tests coming soon).

* feat: tests for HTML bits

Add tests for the HTML bits - CSS holding off until parser lands.

* feat: CSS tests

New CSS parser works great!

* fix: link href

Fix the href in the boilerplate.

* chore: apply suggestions from code review

Co-authored-by: gikf <60067306+gikf@users.noreply.github.com>

* fix: clarify link element

* fix: optional chaining

* fix: remove unused meta props

* fix: update helper and fix tests

* chore: apply tom's review suggestions

Co-authored-by: Tom <20648924+moT01@users.noreply.github.com>

* chore: no console logs

Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>

* feat: intro

Add introductory text, tweak instructions a bit.

Co-authored-by: gikf <60067306+gikf@users.noreply.github.com>
Co-authored-by: Tom <20648924+moT01@users.noreply.github.com>
Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>
2021-09-10 17:17:03 +01:00

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Markdown

---
id: 60a3e3396c7b40068ad6997d
title: Part 20
challengeType: 0
dashedName: part-20
---
# --description--
Use margins to position the `.one` element on the canvas.
Add the shorthand `margin: 20px auto;` to set the top and bottom margins to 20 pixels, and center it horizontally.
# --hints--
You should set the `margin` property to `20px auto`.
```js
const marginFilter = new __helpers.CSSHelp(document).getCSSRules().filter(x => x.style.margin === '20px auto');
assert(marginFilter.length === 2);
```
Your `.one` element should have a `margin` value of `20px auto`.
```js
const oneMargin = new __helpers.CSSHelp(document).getStyle('.one')?.getPropertyValue('margin');
assert(oneMargin === '20px auto');
```
# --seed--
## --seed-contents--
```css
.canvas {
width: 500px;
height: 600px;
background-color: #4d0f00;
}
.frame {
border: 50px solid black;
width: 500px;
padding: 50px;
margin: 20px auto;
}
.one {
width: 425px;
height: 150px;
background-color: #efb762;
--fcc-editable-region--
--fcc-editable-region--
}
```
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Rothko</title>
<link href="./styles.css" rel="stylesheet">
</head>
<body>
<div class="frame">
<div class="canvas">
<div class="one"></div>
</div>
</div>
</body>
</html>
```