所属分类：web前端开发
示例
微博登录
QQ登录<html>
<head>
</head>
<body>
<div style = "background-color:red; width:300px; height:100px; position:relative; top:10px; left:80px; z-index:2">
</div>
<div style = "background-color:yellow; width:300px; height:100px; position:relative; top:-60px; left:35px; z-index:1;">
</div>
<div style = "background-color:green; width:300px; height:100px; position:relative; top:-220px; left:120px; z-index:3;">
</div>
</body>
</html>