As per Leo’s request so I hope this helps others too.
This is my first time using the GP theme and I have a background image and text in the header. Using the pre-defined settings for the background, I can’t get to where I am happy with the desktop & tablet versions vs the mobile. I was looking for advice on custom styling the mobile version.
Also the subtitle looks the same size as the Site Title on the mobile. As I am working in the website, I have it in coming soon mode to share it.