No space above the header

Hello, I´m trying out with catch box, on this page http://aufstellungsrituale.alfahosting.org/TestWP/ but I would like that the page has no space above the header. I can only find this in css html { margin-top: 32px !important; } but when I change this to 0 in custom.css it doesn´t help. Do you have any suggestions. thanx. Or is it better to buy the catchbox pro version.