Template:Dmbox/styles.css

/* {{pp-template}} */
/* Disambig and set index box styles */
table.dmbox {
	clear: both;
	margin: 0.9em 1em;
	border-top: 1px solid #ccc;
	border-bottom: 1px solid #ccc;
	background-color: transparent;
}

This template "Dmbox/styles.css" is from Wikipedia if otherwise notified