.popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.popup-content {
    background: #fff;
    padding: 20px;
    max-width: 400px;
    width: 90%;
    position: relative;
}

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

.submit-btn {
    margin-top: 20px;
    background-color: rgb(0, 0, 0);
    color: rgb(255, 255, 255);
    border-color: rgb(0, 0, 0);
    border-width: 0;
    border-radius: 4px;
    padding: 12px 18px;
    display: inline-block;
    text-decoration: none;
}