Catch Responsive free Theme – change colour of menues

Dear Community, I am an absolute beginner with wordpress, so sorry for a maybe stupid question: In the catch responsive theme, the background color of the main menue is black and I want to change this by putting the right code into the additonal CSS block. I was already able to change the color of the footer, but I cannot find the right words for the main menue. Additionally I would like to change the color of the text within the footer...maybe you can help with this as well. Thanks! Best, Chiara