I discovered a way to change the appearance of a regular video element using this CSS code:
transform: rotate(9deg) !important;
But, when I try to make the video fullscreen, the user-agent CSS rules seem to automatically take control:
https://i.sstatic.net/cw26e.png
Is there a way for me to override these user-agent rules completely? It appears that the transform property is being overridden since it's struck through, yet the video doesn't actually rotate.