<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style style="text/css">
ul li{
list-style: none;
}
li{
width:200px;
height:200px;
line-height: 200px;
float:left;
text-align: center;
border:solid 1px #dedede;
}
li img{
display: inline-block;
max-height:100%;
max-width:100%;
vertical-align: middle;
}
</style>
</head>
<body>
<div>
<ul>
<li>
<img src="img/1.jpg" />
</li>
<li>
<img src="img/2.jpg" />
</li>
<li>
<img src="img/3.jpg" />
</li>
<li>
<img src="img/4.jpg" />
</li>
</ul>
</div>
</body>
</html>
