@charset "utf-8";
*{padding:0; margin:0; list-style:none;}
    .fl{
        width:800px;
        height:710px;
        position:fixed;
        overflow:hidden;
        border:1px solid #CCC;
        left:50%;
        top:50%;
        z-index:100;
        margin-left:-350px;/*宽一半*/
        margin-top:-300px;/*高一半*/
        }