box-shadow:阴影水平偏移值(可取正负值); 阴影垂直偏移值(可取正负值);阴影模糊值;阴影颜色;
-moz-box-shadow:2px 6px 10px #888888;
-webkit-box-shadow:2px 6px 10px #888888;
box-shadow:2px 6px 10px #888888;
filter: progid:DXImageTransform.Microsoft.Shadow(color='#888888', Direction=135, Strength=8)