css实现div阴影效果，兼容性较好

css"><style type="text/css">
div {
 width:500px; height:500px; margin:0px; background:#FFFFFF;
/*
第一个参数是x轴阴影段长度
第二个参数是y轴阴影段长度
第三个参数是往四周阴影段长度
第四个参数是阴影段颜色
*/
 box-shadow:0px 0px 10px #CCCCCC;
 -moz-box-shadow:0px 0px 10px #CCCCCC;
 -webkit-box-shadow:0px 0px 10px #CCCCCC;
/*direction 阴影角度 0°为从下往上 顺时针方向 strength 阴影段长度*/
 -ms-filter:"progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=0, strength=6)\
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=90, strength=6)\
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=180, strength=6)\
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=270, strength=6)";
 *filter:progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=0, strength=6)
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=90, strength=6)
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=180, strength=6)
 progid:DXImageTransform.Microsoft.Shadow(color=#E9E9E9, direction=270, strength=6);
}
</style>
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