freeCodeCamp/curriculum/challenges/italian/14-responsive-web-design-22/learn-css-flexbox-by-buildi.../6153938dce8b294ff8f5a4e9.md

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---
id: 6153938dce8b294ff8f5a4e9
title: Step 14
challengeType: 0
dashedName: step-14
---
# --description--
La proprietà `justify-content` determina come sono posizionati gli oggetti all'interno di un contenitore flex lungo l'asse principale, influenzando la loro posizione e lo spazio intorno a loro.
Assegna al selettore `#gallery` una proprietà `justify-content` con il valore `center`.
# --hints--
Il selettore `#gallery` dovrebbe avere una proprietà `justify-content` con il valore `center`.
```js
assert(new __helpers.CSSHelp(document).getStyle('#gallery')?.justifyContent === 'center');
```
# --seed--
## --seed-contents--
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Photo Gallery</title>
<link rel="stylesheet" href="./styles.css">
</head>
<body>
<div class="header">
<h1>CSS FLEXBOX PHOTO GALLERY</h1>
</div>
<div id="gallery">
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/1.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/2.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/3.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/4.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/5.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/6.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/7.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/8.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/9.jpg"/>
<img src="https://cdn.freecodecamp.org/curriculum/css-photo-gallery/10.jpg"/>
</div>
</body>
</html>
```
```css
* {
box-sizing: border-box;
}
body {
margin: 0;
font-family: Arial;
background: #EBE7E7;
}
.header {
text-align: center;
padding: 32px;
background: #E0DDDD;
}
--fcc-editable-region--
#gallery {
display: flex;
flex-direction: row;
flex-wrap: wrap;
}
--fcc-editable-region--
#gallery img {
width: 25%;
height: 300px;
}
```