Thread:Sinthorion/@comment-25947183-20150308143924/@comment-27723099-20150316212948

In the Special:ThemeDesigner, you can set the theme (you probably already know that). There you can see two colors for the background "main" and "middle", and four colors for the rest of the page "buttons", "links" (usually blue), "header" (the bar at the bottom), and "main" (the background of the center).

I have no idea what the color background:middle defines, if that's the question. It seems to have something to do with the graphic that you can define, but I don't see any difference.