freeCodeCamp/curriculum/challenges/italian/14-responsive-web-design-22/learn-responsive-web-design.../612e8eebe3a6dc3fcc33a66f.md

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---
id: 612e8eebe3a6dc3fcc33a66f
title: Step 11
challengeType: 0
dashedName: step-11
---
# --description--
Ora seleziona l'elemento `#piano` con un selettore di `id`. Imposta `background-color` a `#00471b`, `width` a `992px` e `height` a `290px`.
# --hints--
Dovresti avere un selettore `#piano`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#piano'));
```
Il selettore `#piano` dovrebbe avere la proprietà `background-color` impostata a `#00471b`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#piano')?.backgroundColor === 'rgb(0, 71, 27)');
```
Il selettore `#piano` dovrebbe avere una proprietà `width` impostata su `992px`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#piano')?.width === '992px');
```
Il selettore `#piano` dovrebbe avere una proprietà `height` impostata su `290px`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#piano')?.height === '290px');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Piano</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="./styles.css">
</head>
<body>
<div id="piano">
<div class="keys">
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
<div class="key black--key"></div>
</div>
</div>
</body>
</html>
```
```css
html {
box-sizing: border-box;
}
*, *::before, *::after {
box-sizing: inherit;
}
--fcc-editable-region--
--fcc-editable-region--
```