body {
    background: #f5ece3;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
}

#player {
    display: flex;
    justify-content: center;
    align-items: center;
}

#player > iframe {
    max-height: calc( 100vh - 10px );
    max-width: 100%;
    margin: 5px;
}