Shrink the fit surface to 16:9 1600x900 so the fit-scaler upscales the whole
board ~1.2x (more readable from across the shop) and it fills a 1080p TV exactly.
Footer was position:fixed inside a transformed ancestor so it floated at the
content bottom; make it in-flow with margin-top:auto (flex column) so it pins to
the bottom of the surface = the screen bottom.