编写HTML5页面，CSS中设置"margin:0px,auto"不能使div居中，请问是何原因？
html页面代码如下：
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <link href="css/login.css" rel="stylesheet" /> <script src="js/LoadJs.js" type="text/javascript"></script></head><body> <div class="Fu"> </div> </form></body></html>
body { background-color:rgba(241,244,245,80); margin:0px; padding:0px; text-align:center;}.Fu { margin:0px,auto; padding:0px; width:400px; height:200px; background-color:#FFF; border:1px solid #000;}
margin:0px auto;
空格
margin:0px auto;
空格
