// High Resolution Mediaqueries
hdpi($ratio = 1.25)
  $res = (($ratio * 96) * 1dpi);
  @media (-webkit-min-device-pixel-ratio: $ratio), (min-resolution: $res)
    {block}

x2()
  +hdpi(2)
    {block}

x3()
  +hdpi(3)
    {block}