Comment form has a bug on narrow screens

[hoosteeno]

The #cmt-ackbar label overlaps the #cmt-cmt label on narrow screens, as seen in the below screenshot:

This appears to be fixed by making the "left" rule on #cmt-ackbar -1000vw instead of -100vw:

https://github.com/potch/hax/blob/master/Hax/css/screen.css#L616

#cmt-ackbar {
  position: absolute;
  left: -999em;
  left: -1000vw;
}