Mobile view hides part of demo

[DougInAMug]

On smaller screens, the demo screencasts are truncate on the right hand side. It seems like it might be worth updating Asciinema first (v2.4.1 used in this page is ~6 years old) before manually changing the CSS to fix this.

[ThomasWaldmann]

Yeah, this should be part of making the new borg2 screencasts.