MediaWiki:Gadget-CollapsibleNav.css

.collapsible-nav > .mw-collapsible-toggle { float: none; cursor: pointer; }

.collapsible-nav > .mw-collapsible-toggle::before { display: inline-block; width: 12px; content: url(/w/resources/src/mediawiki.icon/images/arrow-expanded.svg?d0685); }

.collapsible-nav > .mw-collapsible-toggle-collapsed::before { content: url(/w/resources/src/mediawiki.icon/images/arrow-collapsed-ltr.svg?40e9a); }