Thoughts Theme

Dear Worpress-Users,

I found a quite nice responsive theme called “Thoughts”.
http://www.wpexplorer.com/thoughts-wordpress-theme/
I would like to let the pages slide behind the fixed Header including sub-titel&search form. I changed the style.css and fixed the position in #header etc. It works so far but i cannot keep distance between subtitle/search form and the page (In this case it starts with the buddah img.).

Could someone help me to solve the problem accurately?

Thanks so much
Mike