Okay I may have it figured out. It looks like the ‘Flex Wrapper’ is set to 100vh. This is okay, except that the sidebar is content has a larger height than this. I changed it to 125vh, then set the side bar to overlfow: hidden and that seemed to work okay. This will also affect the size of the main content though.
Thanks Hamilton Planning on another lay-out for now - So it won’t be necessarily for my anymore. I would probably run into in in the future again. Much appreciated.