@bugphunk i do not know exactly
its not an impact at the moment, but you css entries should start with your modulename as a class (preceding .) as there is no way to scope the elements in your css file to just your module
For the other styles, use the developers window, elements tab to locate, examine and test css styles, to determine what should go in your css file
See the second link in my signature below for a quick intro to the elements tab