div{
    display: flex;
    justify-content: center;
}

@media only screen and (orientation: landscape) {
    #live-player{
        width: 100%;
        max-width: 854px;
        height: 100%;
        max-height: 480px;
        aspect-ratio: 16/9;
    }
}

@media only screen and (orientation: portrait) {
    #live-player{
        width: 100%;
        max-width: 480px;
        height: 100%;
        max-height: 854px;
        aspect-ratio: 9/16;
    }
}