İstediğiniz div elementine aşağıdaki classı atayarak gölge verebilirsiniz
Örnek:
http://www.webtoolkit.info/demo/css-drop-shadow
.golgeli_kutu {
/*Suat ATAN suatatan.wordpress.com*/
-moz-box-shadow: 3px 3px 4px #000;
-webkit-box-shadow: 3px 3px 4px #000;
box-shadow: 3px 3px 4px #000;
/* For IE 8 */
-ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')";
/* For IE 5.5 - 7 */
filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000');
}