.modal-popup {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-popup-content {
    background: #fff;
    margin: 10% auto;
    padding: 20px;
    width: 80%;
    max-width: 800px;
    border-radius: 8px;
    position: relative;
}

.modal-popup-close {
    position: absolute;
    top: 10px; right: 15px;
    font-size: 24px;
    cursor: pointer;
}