Conversion of AS/CN/US to ER

AS to ER https://www.drive2.com/b/645959783857258688/ and https://www.drive2.com/b/679804950783467347/

CN to ER https://www.drive2.com/b/646366603159555425/

Conversion between screen sizes https://www.drive2.com/b/644918546345774500/