Bouquet, DuskToDawn, and Gamepress which are skins that have been ported from Wordpress to MediaWiki still contain CSS specific to WordPress. Here's an example from Gamepress, starting at line 228:
.accordion { position: relative; } .accordion-header { font-family: 'OpenSansRegular', Tahoma, sans-serif; font-size: 13px; padding: 6px 12px; border-radius: 5px; -moz-border-radius: 5px; -webkit-border-radius: 5px; margin: 0 0 1px 0; cursor: pointer; } .accordion-header a:hover { border: none !important; } .accordion-header a:before { content: ''; width: 8px; height: 8px; display: block; float: left; margin: 6px 6px 0 0; } .accordion-header.current a:before { margin: 4px 6px 0 0; } .accordion-header a { border: none; } .accordion .pane { padding: 10px 22px; border-top: 0; margin-top: -2px; position: relative; top: 1px; margin-bottom: 2px; overflow: auto; display: hidden; zoom: 1; }