User blog comment:Rupert Giles/Global Navigation January Update/@comment-452-20150205134929/@comment-452-20150206170730

Yes, I can, and have, fixed it for myself: User:452/global.css.

I'm sorry that I was unclear that my concern is how other users see the avatars of others. (I've edited my post to make that more clear from the outset.)

I suggest you continue reading the comments to find out "how to change the name of the wiki in the search bar", because I've linked the appropriate mediawiki page at least twice.