/* pour le mobile : forcer en portrait */
@media screen and (min-width: 320px) and (max-width: 750px) and (orientation: portrait) {
    html {
        transform: rotate(90deg);
        transform-origin: right top;
        width: 100vh;
        overflow-x: hidden;
        position: absolute;
        top: 100%;
        right: 0;
    }
}