@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min--moz-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: 192dpi), only screen and (min-resolution: 2dppx) {
  .test {
    background: url("../images/@2x/aa.jpg") no-repeat left top;
    background-size: cover; }

  .content-inner:before {
    position: absolute;
    top: 56px;
    left: 0;
    content: "";
    background: url(../images/outline.png) no-repeat center bottom 10px;
    width: 100%;
    height: 100%;
    background-size: 100% 100%; } }