.spritesheet {
  background: url( '../images/spritesheet.png' ) no-repeat;
  background-size: 156px 26px;
}

.spritesheet.sprite-logo {
  width: 156px;
  height: 14px;
  background-position: 0 0;
}

.spritesheet.sprite-twitter {
  width: 15px;
  height: 12px;
  background-position: 0 -14px;
}

.spritesheet.sprite-instagram {
  width: 11px;
  height: 12px;
  background-position: -15px -14px;
}



@media (min--moz-device-pixel-ratio: 2),
(-o-min-device-pixel-ratio: 2/1),
(-webkit-min-device-pixel-ratio: 2),
(min-device-pixel-ratio: 2) {
.spritesheet {
  background: url( '../images/spritesheet-retina.png' ) no-repeat;
  background-size: 156px 25px;
}

}