Miggz

@import compass

$icons: sprite-map("icons/*.png")
$icons-hd: sprite-map("icons-hd/*.png")

i
  background: $icons
  display: inline-block
  @media (-webkit-min-device-pixel-ratio: 1.5), (min-resolution: 144dpi)
    background-size: image-width(sprite-path($sprites)), auto !important