@media (min-width: 480px) and (max-width: 599px) {
    iframe {
        width: 480px !important;
    }
}

@media (max-width: 479px) {
    iframe {
        width: 320px !important;
    }
}
@media (min-width: 600px) and (max-width: 767px) {
       iframe {
        width: 768px !important;
    }
}
@media (min-width: 768px) and (max-width: 959px) {
     iframe {
        width: 768px !important;
    }
}