.img-test.qualita {
    background: url(../../images/frontend/hp/violin-6-h-d.jpg) 100% 50% no-repeat;
    background-size: cover;
}


@media all and (max-width: 767px){
    .img-test.qualita {
        background: url(../../images/frontend/hp/violin-6.jpg) 50% 50% no-repeat;
        background-size: cover;
    }
}

@media all and (max-width: 600px){
    .img-test.qualita {
        background: url(../../images/frontend/hp/violin-6.jpg) 100% 50% no-repeat;
        background-size: cover;
    }
}

@media all and (max-width: 500px){
    .img-test.qualita {
        background: url(../../images/frontend/hp/violin-6-h.jpg) 50% 50% no-repeat;
        background-size: cover;
    }
}