Move header & decrease width of menu bar

Hi, First of all: I'm loving the theme and all the support you give. It's great! I would like to know two things: 1. How do I move my site's header down, so that there's some additional purple space at the top? 2. How do I decrease the width of my menu bar, without forcing some of the menu buttons to form a second line? This is the website: http://madeby-yvette.nl/ Thanks so much!