MediaWiki:CollapsibleTemplates.css

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/* Styles for collapsible divs to be used in templates.
   Background stolen from Vector menus.
*/
div.collapsibletemplate .headertext {
   padding-left: 18px;
   background: url(//bits.wikimedia.org/w/extensions/Vector/modules/images/open.png) 0 50% no-repeat;
}
div.collapsibletemplate.collapsed .headertext {
   background: url(//bits.wikimedia.org/w/extensions/Vector/modules/images/closed-ltr.png) 0 50% no-repeat;
}
div.collapsibletemplate .header {
   padding: 3px;   
   cursor: pointer;
}
table.collapsible tbody tr th {
   padding-right: 18px;
   background: url(//bits.wikimedia.org/w/extensions/Vector/modules/images/open.png) 99% 50% no-repeat;
}
table.collapsible.collapsed tbody tr th {
   background: url(//bits.wikimedia.org/w/extensions/Vector/modules/images/closed-ltr.png) 99% 50% no-repeat;
   cursor: pointer;
}

.hidden{
   display:none;
}