Hi Mark,
I'd prefer the image centered over the text below it.
https://groups.io/org/groupsio/1A-Travelzine

I think Message History is knocking the page out of whack. Can you put the cells closer together so the width is the same as the text above?

Since "It doesn't rely on a specific image size", you'll want to change the upload instructions on this page.
https://groups.io/org/groupsio/GROUPNAME/coverphoto

Thanks,
Linda