Hello and congratulations for your wonderful products.
As you can see from the link indicated, my goal is to insert a background logo of a div (gray banner) higher than the banner itself.
So to have the second div (white) next to the protruding part of the logo.
I succeeded in my intent BUT without using your CSS, customizing excessively, as you can see from the HTML: I duplicated the header for the desktop version and the mobile version.
I would like, also to have a good responsive answer, to be able to use your css classes without duplication.
PS: I used the custom.css without modifying the template core.
Thank you