inner box shadow

div {
     box-shadow: inset 0 0 10px #000000;
}

.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;
}