/****************  MEDIA QUERIES  ****************/
/* smartphones, iPhone, portrait 480x320 phones */ 

@media (max-width: 750px)  {
    .RESPONSIVE-CAS-USAGE {
        display: flex;
        flex-direction: column-reverse;
    }
    .BLOC-RESPONSIVE {
        display: flex;
        justify-content: center;
    }
}