.montai-modal-popup,
.montai-modal-popup .overlay {
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}

.montai-modal-popup {
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    transition: opacity .4s, visibility 0s .4s;
}

body:not(.montai-added-to-cart) .montai-modal-popup {
    opacity: 0;
    visibility: hidden;
}

body.montai-added-to-cart .montai-modal-popup {
    transition-delay: 0s;
}

.montai-modal-popup .frame {
    width: 400px;
    background: var(--off-white);
    padding: 1em;
    box-shadow: 0 0 10px rgba(0,0,0,.2);
    position: relative;
    z-index: 1;
}

.montai-modal-popup .overlay {
    position: absolute;
    background: rgba(0,0,0,.7)
}