#bfwpf_success_popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 480px;
    padding: 15px;
    text-align: center;
}

#bfwpf_success_popup::backdrop {
    background-image: linear-gradient(
        45deg,
        #b68250,
        #382f2d,
        #0c0807,
        #000
    );    
    opacity: 0.85;
}