I'm running a single page site, as a child theme of Superhero, and I want to insert a full screen width header image just below the banner/nav.
At the moment the header image I've just inserted into the page, and it is contained within the main container, but I'd like it to sit snugly below the banner, and stretch the entire screen, as used in this live demo.
I've seen people say you need to put it into a post as a featured image, but my site is a page - is this possible? If so, how?
Thanks in advance