.access-popup__preview {
    position: relative;
    padding-bottom: 7px;
}

.access-popup__preview::before {
    content: '';
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    position: absolute;
    display: block;
    background: linear-gradient(to top,#fff,rgba(255,255,255,0));
}