Please help! Applying homepage style to rest of website

Hello!

I’m at my wit’s end here and I just can’t figure out how to do this, so I’m turning to the forums.

My website is here You can see that on the homepage, there’s a nice header that scrolls up and down with the menu, but on the rest of the pages (like this one), there is a large gap between the top of the page and the start of the header image.

How on earth do I apply the same style to all pages? I’ve tried editing the various header.php files, but with no luck.

Thanks so much!
– Josh