.cpt-zb5-popup {

}

.zb5-modal-image-wrapper {
    overflow: hidden;
}

.zb5-modal-close {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 8px; 
    background-color: rgba(255,255,255,0.8) !important;
    border-radius: 50%;
}

@media screen and (max-width: 575px) {
    .cpt-zb5-popup .modal-content {
        max-width: 85%;
        margin: auto;
    }
}