Avoid static position CSS in header to see photo below on background

Avoid static position CSS in header to see photo below on background

I'm designing a template-based&nbsp;<a href="http://sitiosimple.com/interlock/#!/-rubes-landscaping/" target="_blank" style="color: rgb(0, 89, 153);">website</a>. My service provider allows me to include CSS or HTML in head and body of the root site.

I'm designing a template-based website. My service provider allows me to include CSS or HTML in head and body of the root site.

On the top section (header where the logo and menu are) I'm trying that the photo below could be seen behind in the background bit I haven't been able to!

But the solution isn't obviously just adding transparency to the background, because the initial static position of the top header section moves the photo below. It's only after scrolling down that the photo appears in the background.

Any idea of how to avoid that static position (that makes the screen jump when scrolling down) like this sample?

Thanks!

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