.tx-slickmodal {
    text-align: center;
    margin-bottom: 50px;
}
.tx-slickmodal .sm-popup {
    overflow: auto;
    text-align: left;
}
/* this is without .tx-slickmodal ! */
.sm-popup {
    animation-name: sm-fadeIn;
    max-height: 100vh;
    overflow: auto;
}