body{overflow:hidden;}
video, audio, div{display:none;}

.ieupdate_bg{position:absolute;background:url(../img/ie.jpg) no-repeat center center;width:100%;height:100%;display:block;}
.bt_ieupdate{position:absolute;top:50%;left:50%;margin:97px 0 0 58px;width:314px;height:94px;cursor:pointer;}