body{
    margin:0;
}
#map{
    width: 100vw; 
    height: 100vh;
    width: 600px; 
    height: 400px;

    background: green;
}

.yt_player{
    width: 600px;
    height: 400px;
}
.yt_player iframe{
    width: 100%;
    height: 100%;
}