.quote {
    position: relative;
}
.quote:before {
    content: '';
    position: absolute;
    width: 34px;
    height: 26px;
    background: url(../img/sprite.png) -34px -709px no-repeat;
    left: -60px;
    top: 5px;
}

@media only screen and (-webkit-min-device-pixel-ratio: 1.5) {
    .quote:before {
        background-image: url('../img/@2x/sprite.png')!important;
        background-size: 94px auto!important;
    }
}