Board Thread:Support Requests - Designing Your Wiki/@comment-25646820-20161203003631/@comment-168424-20161203004914

You should contact an admin. This looks to be intentional, but may have been put in to override something where the background wasn't dark also. I think the diffs used to have a reddish background for deleted lines and greenish background for added lines.

If you look at w:c:dragonage:MediaWiki:Wikia.css, you'll see this CSS which appears to cause it: td.diff-deletedline, td.diff-addedline { color: #000; }