codice:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Documento senza titolo</title>
</head>
<style>
#griglia > li {
border: 2px solid #333333;
display: inline-block;
width: 160px;
height: 160px;
background-color: #abe2ff;
    margin: 10px 10px 50px 10px;
}
#container {
background: #e3e3e3;
max-width:850px;
margin:0 auto;
padding: 20px;
text-align: center;
}
</style>
<body>
<div id="container">
<ul id="griglia">
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...0001.jpg"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...0000.jpg"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...-110.jpg"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...0001.jpg"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...0000.jpg"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...2017.JPG"></li>
   <li><img class="flex" src="https://www.emporiodelloscooter.com/...0001.jpg"></li>
</ul>
</div>
</body>
</html>