MediaWiki:Common.css

Note: After saving, you may have to bypass your browser's cache to see the changes.

• Firefox / Safari: Hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (⌘-R on a Mac)
• Google Chrome: Press Ctrl-Shift-R (⌘-Shift-R on a Mac)
• Internet Explorer: Hold Ctrl while clicking Refresh, or press Ctrl-F5
• Konqueror: Click Reload or press F5
• Opera: Clear the cache in Tools → Preferences

.collapseButton {		/* 'show'/'hide' buttons created dynamically by the        */
	float: left;		/* CollapsibleTables JavaScript in [[MediaWiki:Common.js]] */
	font-weight: 800;	/* are styled here so they can be customised.              */
	text-align: right;
	width: auto;
}
<!-- No [History] tab for users -->
<?php global $wgUser; if( $wgUser-<isAnon() ) { ?>
      <style type="text/css">
        #ca-history { display: none !important; }
      </style> 
    <?php } ?>