Template:Tree list/styles.css

/* {{pp-template}} */
.treeview ul {
	padding: 0;
	margin: 0;
}

.treeview li {
	padding: 0;
	margin: 0;
	list-style-type: none;
	list-style-image: none;
}

.treeview li li {
	/* Only local URLs accepted, do not use wikimedia URL */
	background: url("https://iiwiki.us/mediawiki/images/1/1d/Local_treeview-grey-line.png") no-repeat 0 -2981px;
	/* @noflip */
	padding-left: 21px;
	text-indent: 0.3em;
}

.treeview li li:last-child {
	background-position: 0 -5971px
}

/* first line here deals with new situation after RemexHTML switch,
 * where emptyline cause the first child to become the 2nd child. Such a mess
 */
.treeview li.emptyline > ul > .mw-empty-elt:first-child + .emptyline,
.treeview li.emptyline > ul > li:first-child {
	background-position: 0 9px
}