点了超链接后，从底下跑到顶上_html/css

 	
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.layWhole{	display: none;	position:absolute;	top:0%;	left:0%;	width:100%;height:100%;	background-color:black;	z-index:1001;	-moz-opacity:0.7;	opacity:.70;/*不透明*/	filter:alpha(opacity=70);}.layContent{	display:none;	position:absolute;	top:25%;	left:25%;	width:50%;	height:50%;	padding:16px;	border:5px solid orange;	background-color:white;	z-index:1002;	overflow:auto;}