div {padding:0px;margin:0px;}

#ast {
	width: 804px;
	height: 569px;
	position: relative;
	font-family: 宋体,arial,sans-serif;
}
#ast .empty{background-color:#EEEEEE;width:100%;height:100%;position:absolute;top:0px;}
#ast .empty .center_cover{width: 403px;height: 283px;top: 142px;left: 200px;position:absolute;background-color:white;}
#astcenter {width:395px;height:213px;top:143px;position:absolute;left:201px;padding-left:7px;padding-top:15px;}
.operation{width: 395px;position: absolute;top:158px;left:209px;}
.copyright-notice{font-size:1.5vh;color:#009688;margin-top:0.5vh;}