media-queries.css

/* #Media Queries
================================================== */

/* Smartphones (portrait and landscape) ----------- */
@media only screen and (min-width : 320px) and (max-width : 480px) {}

/* Smartphones (landscape) ----------- */
@media only screen and (min-width : 321px) {}

/* Smartphones (portrait) ----------- */
@media only screen and (max-width : 320px) {}

/* iPads (portrait and landscape) ----------- */
@media only screen and (min-width : 768px) and (max-width : 1024px) {}

/* iPads (landscape) ----------- */
@media only screen and (min-width : 768px) and (max-width : 1024px) and (orientation : landscape) {}

/* iPads (portrait) ----------- */
@media only screen and (min-width : 768px) and (max-width : 1024px) and (orientation : portrait) {}

/* Desktops and laptops ----------- */
@media only screen and (min-width : 1224px) {}

/* Large screens ----------- */
@media only screen and (min-width : 1824px) {}

/* iPhone 4 ----------- */
@media only screen and (-webkit-min-device-pixel-ratio : 1.5), only screen and (min-device-pixel-ratio : 1.5) {}

/* retina */
@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and (min--moz-device-pixel-ratio: 1.5), only screen and (min-device-pixel-ratio: 1.5) {
	/* Style adjustments for high resolution devices */
}

@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (-moz-min-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (min-device-pixel-ratio: 2), only screen and (min-resolution: 2dppx) {
	/* Style adjustments for high resolution devices */
}

/* ////////////////////////// */

/* retina @2x */
 header {
    background: url([email protected]);
}
@media only screen and (-webkit-min-device-pixel-ratio: 2),
  only screen and (-moz-min-device-pixel-ratio: 2),
  only screen and (-o-min-device-pixel-ratio: 2/1),
  only screen and (min-device-pixel-ratio: 2),
  only screen and (min-resolution: 2dppx) {
    header {
      background: url([email protected]);
      background-size: 50%;
  }
}

/* ////////////////////////// */