.logo-main a {
    background-image: url(/graphics/sb_sunergodemo/sprites_logo.png);
}

@media (min--moz-device-pixel-ratio: 1.5),
(-o-min-device-pixel-ratio: 3/2),
(-webkit-min-device-pixel-ratio: 1.5),
(min-device-pixel-ratio: 1.5),
(min-resolution: 144dpi),
(min-resolution: 1.5dppx) {
    .logo-main a {
        background-image: url(/graphics/sb_sunergodemo/sprites_logo@2x.png);
    }
}