css3阴影过度

.ad-left a{display:inline-block; *zoom:1; *display:inline; width:485px; height:301px; position:relative; margin:0 15px 30px 15px;  overflow:hidden; background:#fff;transition: width .5s;-moz-transition: box-shadow .5s;-webkit-transition: box-shadow .5s;-o-transition: box-shadow .5s; }