css 实例之实现DIV水平垂直居中于屏幕

编辑代码

<!DOCTYPE html> 
<html> 
<head> 

<title>css 实现DIV水平垂直居中于屏幕</title>
<style type="text/css"> 
body{ 
  margin:0px; 
  padding:0px; 
} 
#thediv{
  width:100px;
  height:100px;
  background:green;
  position:absolute;
  left:50%;
  top:50%;
  margin-left:-50px;
  margin-top:-50px;
}
</style> 
</head> 
<body> 
<div id="thediv"></div>
</body> 
</html>