浮层

.black_layer{ width:100%; height:100%; background:#000; position:absolute; z-index:99; top:0; left:0px;  opacity:0.5;-khtml-opacity:0.5;-moz-opacity: 0.5;

filter: progid: DXImageTransform.Microsoft.Alpha( opacity=50 ); /* IE6, IE7, and IE8 */

-ms-filter : "progid:DXImageTransform.Microsoft.Alpha( opacity=50 )"; /* IE8 only */}

 

 

.s_sns_mask {left: 33%;top: 33%;z-index: 150;width: 370px;height: 186px;font-size: 14px;color: #707070;postion:absolute}