.reference {
	display: inline-block;
	padding: 4px;
	padding-left: 8px;
	padding-right: 8px;
	border-radius: 4px;
	background-color: #ccc;
	color: #333;
	font-size: 0.8em;
	font-family: Arial, Helvetica, sans-serif;
	margin-left: 15px;
}