Mainpage/styles.css

.mainpage-scrollable-table .wikitable {
	height: 500px;
	overflow-y: scroll;
	display: block;
	padding: 0; /* For Timeless */
}

.mainpage-scrollable-table .wikitable tr:first-child {
	position: sticky;
	top: 0;
}

.comment {
	word-break: break-all;
}