#vr {
    padding-bottom: 56%;
    position: relative;
}

#vr iframe {
    border: none;
    position: absolute;
    z-index: 100;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
}

@media screen and (max-width: 480px) {
    #vr {
        padding-bottom: 76%;
    }
}