Current video uploads format (above) can't be styled from the frontend, so you are locked into whatever styling has been added to the backend developer code. You are also at risk of the code becoming outdated which is probably the issue here.

YouTube Embed

This module can be resized as required. Cover images can be added + a bunch of other configuration options.

It is also possible embed playlists or channels (if they are set up in YouTube) so the viewer will automatically be shown another ATUNE video.

Facebook Video Embed with Post Info

Facebook Video Embed without Post Info