freeCodeCamp/curriculum/challenges/italian/14-responsive-web-design-22/learn-the-css-box-model-by-.../60a3e3396c7b40068ad6998a.md

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---
id: 60a3e3396c7b40068ad6998a
title: Step 32
challengeType: 0
dashedName: step-32
---
# --description--
Centra l'elemento `.three` sulla tela impostando la sua proprietà `margin` su `auto`.
# --hints--
Dovresti assegnare alla proprietà `margin` il valore `auto`.
```js
const marginFilter = new __helpers.CSSHelp(document).getCSSRules().filter(x => x.style.margin === 'auto');
assert(marginFilter.length === 2);
```
Il selettore `.three` dovrebbe avere una proprietà `margin` con il valore `auto`.
```js
const threeMargin = new __helpers.CSSHelp(document).getStyle('.three')?.getPropertyValue('margin');
assert(threeMargin === 'auto');
```
# --seed--
## --seed-contents--
```css
.canvas {
width: 500px;
height: 600px;
background-color: #4d0f00;
overflow: hidden;
}
.frame {
border: 50px solid black;
width: 500px;
padding: 50px;
margin: 20px auto;
}
.one {
width: 425px;
height: 150px;
background-color: #efb762;
margin: 20px auto;
}
.two {
width: 475px;
height: 200px;
background-color: #8f0401;
margin: auto;
}
.three {
width: 91%;
height: 28%;
background-color: #b20403;
--fcc-editable-region--
--fcc-editable-region--
}
```
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Rothko Painting</title>
<link href="./styles.css" rel="stylesheet">
</head>
<body>
<div class="frame">
<div class="canvas">
<div class="one"></div>
<div class="two"></div>
<div class="three"></div>
</div>
</div>
</body>
</html>
```