freeCodeCamp/curriculum/challenges/italian/14-responsive-web-design-22/learn-the-css-box-model-by-.../60a3e3396c7b40068ad69976.md

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---
id: 60a3e3396c7b40068ad69976
title: Step 13
challengeType: 0
dashedName: step-13
---
# --description--
La cornice è troppo larga.
Nel selettore `.frame`, imposta la proprietà `width` a 500 pixel.
# --hints--
Dovresti assegnare alla proprietà `width` il valore `500px`.
```js
const widthFilter = new __helpers.CSSHelp(document).getCSSRules().filter(x => x.style.width === '500px');
assert(widthFilter.length === 2);
```
Il selettore `.frame` dovrebbe avere una proprietà `width` con il valore `500px`.
```js
const frameWidth = new __helpers.CSSHelp(document).getStyle('.frame')?.getPropertyValue('width');
assert(frameWidth === '500px');
```
# --seed--
## --seed-contents--
```css
.canvas {
width: 500px;
height: 600px;
background-color: #4d0f00;
}
.frame {
border: 50px solid black;
--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>
</div>
</body>
</html>
```