.masthead {
    background-image: url("/assets/img/Background/Team.jpg");
    height: 1200px;
}

@media (min-width: 300px) and (max-width: 670px) {
    .masthead {
        margin-top: 100px;
        height: 550px;
        background-image: url("/assets/img/Background/Team_mob.jpg");
    }
}
@media (min-width: 381px) and (max-width: 992px) {
    .masthead {
        margin-top:100px;
        height:550px;
        background-image: url("/assets/img/Background/Team_mob.jpg");
    }
}
@media (min-width: 790px) and (max-width: 1200px) {
    .masthead {
        margin-top: 120px;
        height: 850px;
        background-image: url("/assets/img/Background/Team_mob.jpg");
    }
}