html, body {
    margin: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}
#map {
    width: 90vmin;
    height: 90vmin;
    max-width: 90vmin;
    max-height: 90vmin;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: 50%;
    box-shadow: 0 18px 35px rgba(0,0,0,0.2);
}
#map iframe,
#map canvas,
#map > div {
    width: 100% !important;
    height: 100% !important;
    max-width: 100% !important;
    max-height: 100% !important;
    display: block;
    object-fit: contain;
}