Board Thread:Support Requests - Getting Technical/@comment-1295676-20160902212709/@comment-5454372-20160903004710

Just checked the two infoboxes using element inspector from Firefox, and there're a couple of divs with classes in your infobox that don't exist in the one used by the Katanagatari Wiki. I'm guessing it has to do with the tabs that your infobox uses on Zaregoto Series Wiki. (Edit: yeah, it's actually got to do with the  you're using in the infobox)

This snippet seems to do what you want, though it'll most likely remove the background colour from any  you're using on the wiki, including the ones outside of infoboxes:

.pi-image-collection-tab-content { background-color: transparent; }

Edit: I see what's happening now, it's the  feature you're using inside the infobox that's creating the coloured background. If you want the background colour removed from only the galleries being used in infoboxes, use this instead:

.portable-infobox .pi-image-collection-tab-content { background-color: transparent; }