.subnav{
width: 220px;
_width:160px;
min-height: 168px;
border: 1px solid #d0d8da;
background: #fff;
box-shadow: 0px 2px 2px #BEBEBE;
filter:progid:DXImageTransform.Microsoft.Shadow(Strength=2,Direction=135,Color=‘#999999‘);position:relative;_left: -2px;
}
原文：http://www.cnblogs.com/koleyang/p/5230330.html