@betro-hakala I don't even know what you want to be transparent. Also, if you are using Vanilla theme (not Persona) then the theme's options won't be in NodeBB Category options, those are completely different.
Could you send a screenshot of what you want transparent? That would help us help you.
Hey @Schamper, re: your cards plugin, have you noticed that if you're too slow with the mouse, the tooltip goes away?
For example, in the above toolip, if I want to go to the "chat" button, my mouse travels diagonally from my circle avatar to the chat bubble icon. However, in doing so, I exit the cards container, and if I do not re-enter it quickly enough, bye bye tooltip!
The workaround, of course, is to clunkily fix my mouse path to go straight up into the box, make a 90 degree turn, and travel across to the chat icon. (Obligatory shoutout to @a_5mith: Yes, I feel the need to start a chat with myself)
It reminds me of this article I read last year about how Amazon tackled this problem: http://bjk5.com/post/44698559168/breaking-down-amazons-mega-dropdown
But hell, even without going through those shenanigans, you can probably just extend the popover container down a bit... possibly...