<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>zuoye</title>
<style type="text/css">
.btn{
display: block;
width: 42px;
height: 32px;
background-image: url(img/amazon-sprite_.png);
background-repeat: no-repeat;
background-position: -10px -339px;
margin:0 auto;
margin-top: 150px;
}
.btn:hover{
background-position: -59px -339px;
}
</style>
</head>
<body>
<a href="#"class="btn"></a>
</body>
</html>
