Board Thread:Support Requests - Designing Your Wiki/@comment-4530178-20190613123533/@comment-23989026-20190613130210

Having a quick look at your MediaWiki:Wikia.css this controls it

{virtually at bottom of page) .oasis-dark-theme div.ajax-poll div.header {   background-color: #0C0C0C;    padding: 12px;    margin-left: -14px !important;    margin-top: -14px !important;    margin-right: -17px !important;    color: white; }