Videos ought to be less borked on mobile

[FrodoSwaggins]

Videos on mobile (Roundo Darko) are currently borked. They play but are in fact borked off the starboard side of the screen. Please commence deborkification if possible.

Borked example 
https://weliveinhell.net/showthread.php?tid=104

[gorzek]

I'll add it to the list, though no guarantees I ever get to something like that. I really need to install a bug tracker.