.background-splash{
    background-image: url("/imgnew/knowledge-base/port-technology-cover.jpg");
    background-position: 50% 0;
    background-repeat:no-repeat;
    background-color:#33373d;
}

/* retina   */
@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) {
    .background-splash{
        background-image: url("/imgnew/knowledge-base/port-technology-cover@2x.jpg");
        -o-background-size:1200px 320px;
        -webkit-background-size:1200px 320px;
        -khtml-background-size:1200px 320px;
        -moz-background-size:1200px 320px;
        background-size:1200px 320px;
    }
}