Twenty Eleven: Design hacks for menu-bar etc in child theme?

Hi there all,

I am running the site http://din-skypeterapeut.dk and am trying to hack my through some design changes.

Yes, I am using a child theme.

Yes, I have also tried many changes to styles.css but nothing I’ve found seems to get it right. So, I thought a fresh post might help! 🙂

My questions are:

1) How do I change the black colour of the menu bar to white?

2) How do I change the white lettering of the page names in the menu bar to black?

3) How do I change the thin grey border under the menu bar to white?

4) How do I remove / hide the thin grey border at the bottom of every page content, just above where footer.php starts?

Thank you so much for your help in looking into these things.

All the best,
Mark