Background Video deferring to poster on mobile.
Hello all, I'll start by saying I'm very new to this.
What I'm trying to do is make a website with video as the full screen background. As I've read everywhere, this is a bad idea for mobile users, but what you can do is set it up so that instead of loading video, it'll defer to a still poster for your background. I've found a pretty good tutorial on how to do this, but I can't seem to get it to work on my android phone or an iphone that I've tried it with. I feel like I've copied what I'm looking at pretty exactly, and its been very frustrating to not know what I'm doing wrong. It appears to be working fine on an iPad, but not on my phones. I get just a black screen.
Creating a fullscreen HTML5 video background with CSS - Slicejack - This is the tutorial that I'm working from. Below is my attempt. Is there something that I'm doing terribly wrong?


