retina-stuff.styl

image(path, width = auto, height = auto)
  background-image: url(path)
  @media all and (-webkit-min-device-pixel-ratio: 1.5)
    ext = extname(path)
    path = pathjoin(dirname(path), basename(path, ext) + '@2x' + ext)
    background-image: url(path)
    background-size: width height

#logo
  image: '/images/logo.main.png' 50px 100px