.trombine {width: 50%; height: auto;}
.trombine img {width: 100%; height: auto; border-radius: 10rem; border: 1.5vw solid #fff; background-color: #000;}
.masthead h1, .masthead .h1 {background-color: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.1));}

@media (min-width: 576px) {
    .trombine {width: 50%}
    .trombine img{border-width: 1.25vw;}
}
@media (min-width: 768px) {
    .trombine {width: 40%}
    .trombine img{border-width: 1vw;}
}
@media (min-width: 992px) {
    .trombine {width: 30%}
    .trombine img{border-width: 0.75vw;}
}
@media (min-width: 1200px) {
    .trombine {width: 25%}
    .trombine img{border-width: 0.5vw;}
}
@media (min-width: 1400px) {

}