multilayer shadow in css
/* Default box-shadow */
.box {
box-shadow: 0 3px 3px rgba(0,0,0,0.2);
}
/* Create smoother box-shadows by layering multiple
* shadows with gradually increasing radius and offset */
.shadow-5 {
box-shadow: 0 1px 1px rgba(0,0,0,0.12),
0 2px 2px rgba(0,0,0,0.12),
0 4px 4px rgba(0,0,0,0.12),
0 8px 8px rgba(0,0,0,0.12),
0 16px 16px rgba(0,0,0,0.12);
}