I removed all the css I had added to try and do this – and the new page still has no border and the old ones have a border?

What the heck?

I don’t believe I’m using CDN service. The videos are uploaded onto my server via FTP. From there I direct link them via the Video element provided by the Enfold theme, under Media elements. Under video elements, the only options provided are the video URL and the video format ratio, so I don’t see how it’s provided to specify a frame image. Thanks.