Board Thread:Support Requests - Designing Your Wikia/@comment-26731725-20151121003138

.portable-infobox.pi-theme-nation .pi-background { background-color:#FFFFF; }

No effect. Still uses the default colour of the wiki theme in Theme Designer.

I can assure the infobox is currently using the theme because other CSS rules work, like secondary background (header and navigation) as well as center aligning. 