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freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/css-picasso-painting/part-010.md
Nicholas Carrigan (he/him) fa84f6c449 feat(curriculum): css picasso painting (#42436)
* feat: generating steps

- Steps 1-32 done.
- Steps 33-80 done.
- Instructions 1-26 done.
- Instructions 27-61 done.
- More steps.
- Instructions 62-88 done.
- Clarify instructions for new concepts.
- build fixes
- Audit instructions on live site.

* fix: add helpCategory

* feat: write tests

* feat: add intro

* chore: use the right selectors

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

* chore: cannot read property Shaun of undefined :)

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

* feat: Shau-ptional chaining

* chore: apply shaun's review suggestions

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

* fix: uncross my wires

* chore: apply shaun's review suggestions

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

Co-authored-by: gikf <60067306+gikf@users.noreply.github.com>
Co-authored-by: Shaun Hamilton <shauhami020@gmail.com>
2021-09-07 21:49:42 +02:00

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Markdown

---
id: 60b69a66b6ddb80858c51580
title: Part 10
challengeType: 0
dashedName: part-10
---
# --description--
The `z-index` property is used to create "layers" for your HTML elements. If you are familiar with image editing tools, you may have worked with layers before. This is a similar concept.
Elements with a higher `z-index` value will appear to be layered on top of elements with a lower `z-index` value. This can be combined with the positioning in the previous lesson to create unique effects.
Since the `back-wall` element will need to appear "behind" the other elements you will be creating, give the `back-wall` element a `z-index` of `-1`.
# --hints--
Your `#back-wall` selector should have the `z-index` property set to `-1`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#back-wall')?.zIndex === '-1');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>freeCodeCamp Picasso Painting</title>
<link rel="stylesheet" type="text/css" href="./styles.css" />
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css">
</head>
<body>
<div id="back-wall"></div>
</body>
</html>
```
```css
body {
background-color: rgb(184, 132, 46);
}
#back-wall {
background-color: #8B4513;
width: 100%;
height: 60%;
position: absolute;
top: 0;
left: 0;
--fcc-editable-region--
--fcc-editable-region--
}
```