Help w/ cover image/navbar in Taste theme?

Hi Ghost community,

Does anyone have experience with the Taste theme and can help?

If you look at the theme preview, there’s space for a cover image behind the landing page text and subscribe form. Unfortunately, when I add a cover image, it leaves space at the top so that the navbar and logo are still atop the site’s background color. I would like the cover image to extend up into this section, a la the Edition theme.

I’ve been at it for hours, no luck yet. I presume it has something to do with the container that the navbar and cover image (gh-header-image in the theme code) sit in not being overlapping. I’m a total webdev noob so haven’t been able to figure this out. Any tips would be super appreciated!