Thread:Ursuul/@comment-29826282-20170312024950/@comment-29826282-20170312220729

Staff, in their eternal wisdom, decreed that custom CSS cannot be added to the Mercury skin because it would introduce too much variability. The skin is supposed to work for the widest possible range of mobile devices, and not all devices can handle flashy CSS equally well. Hence the need for a boring blue/white color scheme and a stripped-down functionality base. Meh.

Oh, and for theming, you just add theme="tank" to the infobox tag and then target it with .pi-theme-tank img or whatever.