User blog comment:Kirkburn/Technical Update: March 25, 2015/@comment-90.244.90.90-20150328113606/@comment-1398253-20150331135718

Yeah - they appear to be semi-transparent. I wish it wasn't. The one on RangerWiki has a blue tinge and the one on Kamen Rider Wiki has a red tinge, because those are the navbar colours on those wikis.