Background Video on Mobile Size + Position + Auto Play

Ok so I’ve dug around for the past year collecting information and data. But there are no definitive solutions for the scale of video on mobile as it is always blown up, position as it is always justified left and not center, and the auto play feature is completely missing.

Until today this custom code was working for autoplay but no longer works for some reason and is now replaced by a still image with a Play symbol.

Are there any answers as to how to center video, scale down size on mobile if the height is set to 50VH?

Here is my site Read-Only:
(how to share your site Read-Only link)

Your read-only link seems to be broken.
However for the video auto play, you can Add ?autoplay=1 right after the video link and this should auto play the video when launching the page on the published site.