MediaWiki:Common.css

/** Collapsible tables *********************************************************
 *
 *  Description: Allows tables to be collapsed, showing only the header. See
 *                         http://www.mediawiki.org/wiki/Manual:Collapsible_tables.
 *  Maintainers: [[en:User:R. Koot]]
 */
 
table.collapsed tr.collapsible {
        display: none;
}
 
.collapseButton {               /* 'show'/'hide' buttons created dynamically by the             */
        float: right;           /* CollapsibleTables JavaScript in [[MediaWiki:Common.js]] */
        font-weight: normal;    /* are styled here so they can be customised.             */
        text-align: right;
        width: auto;
}