.ar-1-1  {
    aspect-ratio: 1 / 1;
}

.ar-3-2  {
    aspect-ratio: 3 / 2;
}

.ar-4-3  {
    aspect-ratio: 4 / 3;
}

.ar-16-9 {
    aspect-ratio: 16 / 9;
}

.ar-2-3  {
    aspect-ratio: 2 / 3;
}

.ar-3-4  {
    aspect-ratio: 3 / 4;
}

iframe {
    width: 100%;
    display: block;
}