.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.popup-content {
    background: white;
    padding: 20px;
    border-radius: 10px;
    width: 40%;
    position: relative;
}

.close-popup {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 20px;
    cursor: pointer;
}

#proceed-to-checkout {
    background-color: #f76c6c;
    color: white;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
}