HTML code to apply to MediaWiki:SearchBar:

<form name="bodySearch" align="center"id="bodySearch" class="bodySearch" action="/wiki/Special:Search">
<div class="bodySearchWrap" style="display: inline;">
<input type="text" name="search" size="50" id="bodySearchInput" style="border:1px solid #999; padding:10px; width:500px; font-size:20px" placeholder="Search..." />
<input type="submit" name="go" value="Search" class="bodySearchBtnGo" />

CSS code to apply to MediaWiki:Wikia.css:

#bodySearch .bodySearchBtnGo { display: none; } /* hide search button */

This will produce a big search bar, modified from Help:Contents. Example coding:


will produce:

This was originally modified for Isle of Tune Wiki from Wikia Help. Can be copied without adjustments to work