Responsive Vimeo Embeds

I just tried this technique out instead which looks like it would work great:

I think I followed the tutorial exactly as mentioned, However I have an issue where all the videos end up at the top of my page which can be seen here:

http://stiir.webflow.com

my designer preview can be seen here:
https://webflow.com/design/stiir?preview=aec9ccfe4d26cbeb7d4f8788f8fd44b8

I’m pretty stuck on this, any help would be appreciated. Thanks.