Anyway Rollbit is open for suggestions thus if the gambler raise this feedback to them they will certainly do something to improve it in the future.
Only if a handful amount of people actually complaint about this but for some reason this is probably the first time that someone actually complain about the layout / colour scheme of the site. It doesnt and wont really affect anything while you gamble on the site so I kinda doubt that Rollbit will do something about it even if he raises his concern onto them