Removing top bar

My website is almost complete but I am stuck on one thing.

I need to remove the thick black bar separating the header graphic from the menu.
Then I would like to tighten the space inbetween.

Can you show me where the css code is (i am using a child theme)?

Another thing, I want to change the Footer bar to a different colour – but again just can’t seem to find that css code section either.

I have spent so much time looking.

Thank you so much