Individual page banners with superimposed titles

Developer help
1

Hi, newcomer here.

Ghost was installed and configured using the Ghost One-Click Droplet on DO.

Software:

Ghost-CLI version: 1.17.3
Ghost version: 4.6.4 (at /var/www/ghost)
Theme 'casper': 4.0.5

How do I make image banners for pages like on https://techroads.org? For example, this Ghost page (see header)? On the top of each page there is a banner image with the page title and caption superimposed. These are also left-aligned with a photo gallery underneath. I’m pretty sure this site is using the casper theme.

Thanks in advance!