Adobe Digital Editions Cover image distorted and covers 3 pages

I have just finished compiling my epub 3 book. When I open the epub in Adobe Digital Editions everything is looking good except for the cover image. The width is compressed and the height is very high…

I have ticked the box “Add HTML cover page” - so it seems somehow related to that. The reason I have ticked that box is because otherwise there is no cover preview shown in the Adobe Digital Editions library.

Where can I find a way to tweak the settings on how the cover image should behave in a reader? A potential fix I have read about would be to somehow tweak the cover image html with: style=”height:100%;max-width:100%”. Is that a good way forward, and how would I go about?

Thanks :slight_smile: