Yeah you're right it's still working but not fully. I mean when I made html display block it became unable to use it out of the box. So now I think I shouldn't make it block and making 100vw is not working too.
I don't get it, I showed you the fix - its using fixed with on the container that grows bigger than viewport, that's it, no need to touch html, no need for custom embed code for workarounds
btw maybe its a great idea to have this thing as a template in the marketplace, because it seems like a popular demanded feature and most don't konw how to do it