.video16-9 { 
    position: relative; 
    overflow: hidden; 
    padding-top: 56.25%; 
}
.video16-9 iframe, .carte iframe { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    border: 1px solid black;
}
.carte {
    position: relative;
    width: 100%;
    height: 400px;
}