CSS box-shadow on all four sides

The following CSS code create a box Shadow appears equally on all four sides.

box-shadow: 0 0 10px rgba(0,0,0,0.6);
-moz-box-shadow: 0 0 10px rgba(0,0,0,0.6);
-webkit-box-shadow: 0 0 10px rgba(0,0,0,0.6);
-o-box-shadow: 0 0 10px rgba(0,0,0,0.6);