.jgbanner { height: 500px;}

@media screen and (max-width: 1300px) {
    .jgbanner { height: 40vw;}
    
}

@media screen and (max-width: 620px) {
    .jgbanner img{ width: 180%; position: relative; left: -40%; }
    }
@media screen and (max-width: 480px) {
    .jgbanner img{ width: 200%; position: relative; left: -50%; }
}