Thread:SDMarukokun/@comment-27862737-20170301071415/@comment-4199297-20170318144538

ugh, finally found it at MediaWiki:Oasis-comments-header (from Special:PrefixIndex namespace Mediawiki) and edited it.

BTW, you might want to copy-paste in admin comment colors for yourself at: MediaWiki:Wikia.css (can also be edited through the CCS button on the admin dashboard Special:AdminDashboard ;).