How to place section underneath header?

Question:
How do you get the Wix-Editor to allow a Header to appear on top of a Section (so a seamless image can appear under the header and down into the rest of the page)?

Product:
Wix-Editor

What are you trying to achieve:
I have a header followed by a section with a background image. I would like the header and the first section to overlap which would allow the background to show through the transparent sections of my header. I see this can be done in some of the templates, but none of the videos or tutorials seem to show how to do this using the current Wix-Studio interface.

What have you already tried:
I have watched numerous videos and read tutorial pages that all seem to show/reference an older Wix-Studio interface that uses strips, etc… I’m guessing this is simple but I am stumped!

Additional information:

IF you are meaning in the Wix Studio editor then you change the header to pinned on the right side toolbars. You can then add a scroll event to the header also