Help with obsidian-banners display that is changing between editor and reading mode

I am using the obsidian-banners plugin to show a banner at the top of a template. It is displaying correctly while in reader mode but when i switch to edit mode, the image collapses down and drops down the page. Im guessing there is a style setting somewhere but im still learning this so I could do with some help.

Any help is appreciated.

What I’m trying to do