话不多说，代码如下
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>伸缩布局</title>
<style type="text/css">
*{
margin: 0;
padding:0;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
html,
body {
height: 100%;
}
div{
height: 100px;
width: 100px;
overflow: hidden;
display:flex;
border: 1px dotted red;
align-items: center;
justify-content:center;
}
img{
width: 50px;
height: 50px;
}
</style>
</head>
<body>
<div>
<img src="http://img.mukewang.com/5365d7b10001e8d506350529.jpg" alt="" /></div>
</body>
</html>则图片居中
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