#jsn-master {
   background: rgba(0, 0, 0, 0) url("../images/backgrounds/HG-Anderes.jpg") repeat fixed 0 0 / 100% 100%;
}

@media only screen and (max-width: 960px), (max-device-width: 960px) {

#jsn-master {
   background: rgba(0, 0, 0, 0) url("../images/backgrounds/HG-Anderes.jpg");
}
}