.msgDiv {
display: none; width : 100%;
height: auto;
border: #f4581b 1px solid;
background: #fff;
color: #333;
filter: progid:DXImageTransform.Microsoft.Shadow(color=#f4581b,
direction=120, strength=4); /*ie*/
-moz-box-shadow: 2px 2px 10px #f4581b; /*firefox*/
-webkit-box-shadow: 2px 2px 10px #f4581b; /*safari或chrome*/
box-shadow: 2px 2px 10px #f4581b;
width: 100%; /*opera或ie9*/
}原文地址:http://blog.csdn.net/javaweiming/article/details/40859933