Page without Headermenu

Hello,

I create a page without menu. I have the choice in the pages creation: footer, no lines selected – that fits, is without.
for the header I have chosen: hide header on this page. but i have a big place to start. i will start with mit Logo higher.

Now I do not want to start with a 5 cm empty space but just start on the side with my logo.
I have worked in the color selection with -10pixel. it does not suffice, does not look so good.
How can I optimize the settings?

greetz
Andy