I've noticed that this hard-coded `width: 650px` was more than 5 years
old.
Now some specific CSS modules exists like OCA `web_responsive`
or Openworx `backend_theme` that are doing this kind of job in a much
better way... And this kind of hard-code is blocking them, so it looks
better to remove it and use these modules for CSS purpose.
568e6b41ac