#customAlert {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 9999;
}
#customAlertContent {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
#customAlert button {
    background: #007bff;
    border: none;
    color: #fff;
    padding: 8px 16px;
    border-radius: 5px;
    margin-top: 10px;
}