box shadow bottom only

box-shadow: 0px -8px 10px lightgrey;

box-shadow: 0 4px 2px -2px gray;

.box-bottom-shadow {
	-webkit-box-shadow: 0 8px 6px -6px black;
	   -moz-box-shadow: 0 8px 6px -6px black;
	        box-shadow: 0 8px 6px -6px black;
}