Output from contentful-retina mixin

contentful-retina-output.css

/* usage */
.something {
    @include contentful_retina('space_id/asset_id/token/name.jpg', 1024, 3, cover, no-repeat center center);
}
/* output */
.something {
  background: url("http://images.contentful.com/space_id/asset_id/token/name.jpg?w=1024") no-repeat center center;
  background-size: cover; }
  @media all and (-webkit-min-device-pixel-ratio: 1.5), all and (-o-min-device-pixel-ratio: 3 / 2), all and (min--moz-device-pixel-ratio: 1.5), all and (min-device-pixel-ratio: 1.5) {
    .something {
      background: url("http://images.contentful.com/space_id/asset_id/token/name.jpg?w=2048") no-repeat center center;
      background-size: cover; } }
  @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .something {
      background: url("http://images.contentful.com/space_id/asset_id/token/name.jpg?w=2048") no-repeat center center;
      background-size: cover; } }
  @media (-webkit-min-device-pixel-ratio: 3), (min-resolution: 288dpi) {
    .something {
      background: url("http://images.contentful.com/space_id/asset_id/token/name.jpg?w=3072") no-repeat center center;
      background-size: cover; } }