/**
    aspect ratio  | padding-bottom value
    --------------|----------------------
        16:9      |       56.25%
        4:3       |       75%
        3:2       |       66.66%
        8:5       |       62.5%
**/

.page {
    max-width: calc(3840px - (10.7% / 2));
    max-height: 1896px;
}

.aspect-ratio {
    padding-bottom: calc(1896 / 3840 * 100%);

}

.aspect-ratio iframe {
    max-width: calc(3840px - 10.7%);
    max-height: calc(1896px - 10%);
}