Adjusting display size of background video

Element in progress: When you hover over a thumbnail, the BG video appears. The BG video is being pulled from a CMS element that references links for Webm files hosted on dropbox.

The issue: Everything is working as expected but I cant control the display size. The video is getting cropped by a lot and I want to have it be as full frame as possible.

I am using custom HTML Code in the BG video element to pull the link from a CMS field.

Here is my site Read-Only: Webflow - Minivan Productions