Template:Plain row headers/styles.css

.wikitable.plain-row-headers th[scope=row],
.wikitable.plain-row-headers th[scope=rowgroup] {
	font-weight: normal;
	/* @noflip */
	text-align: left;
}

.wikitable.plain-row-headers-center th[scope=row],
.wikitable.plain-row-headers-center th[scope=rowgroup] {
	font-weight: normal;
}