Neven's Popover

popover.css

.popover {
	/* to be set as appropriate */
	width: 200px;
	height: 200px;
	margin: 20px;
	background-color: white;

	padding: 20px;
	border-radius: 6px;
	position: relative;
	box-shadow: 0 0 15px rgba(0,0,0,.4);
}
.popover:after {
	position: absolute;
	content: '';
	display: block;
	width: 20px;
	height: 20px;
	left: 50%;
	bottom: 0px;
	box-shadow:5px 5px 5px rgba(0,0,0,.1);
	-webkit-transform-origin: 50% 50%;
	-webkit-transform: matrix(0.707, 0.707, -0.707, 0.707, -10, 10);  /* rotate 45deg + shift to center 10px */
	background-color: white;
}