ميدياويكي:Gadget-CollapsibleTemplates.css

.NavFrame .NavHead,
.collapsibleTH,
table.collapsible>tbody>tr:first-child th{
  background: #EFEFEF;
  background-repeat: no-repeat!important;
  background-position: 1% center!important;
  background-size: 15px!important;
  cursor: pointer;
}
.NavHead,
.collapsibleTH,
table.collapsible.expanded>tbody>tr:first-child th {
  background-image: url(//upload.wikimedia.org/wikipedia/commons/e/ec/Angle_down_font_awesome.svg)!important;
}
.collapsed .NavHead,
.collapsible .collapsibleCollapsedTH,
table.collapsible.collapsed>tbody>tr:first-child th
{background-image: url(//upload.wikimedia.org/wikipedia/commons/3/3f/Angle_left_font_awesome.svg)!important;
}
.hidden {display: none;}
.shown {display: block !important;}
.NavFrame.NavPlain{border:none}
.NavPlain .NavHead{background-color:transparent!important;text-align:right}
.NavPlain .NavContent{text-align:right}
.NavRight .NavHead{ background-position: 100% center !important;padding-right: 1.2em!important;}