Qt messagebox stylesheet

[frodi]

Hi everyone.
I am new to Qt. I am currently learning my way around Qt and need some help.
For context, I am checking a variable every 20sec with a function call. If the variable is set, a message box appears. This works, but it is the colour of the text and buttons I need to modify because my background is black.

This is my function:

void MainWindow::connectionStatus()
{
    Socket conn_checker;

    //if(connectionCheck()==false)
    if(tester)
    {
        // Pop-up window with connection warning
        QMessageBox msg(this);
        msg.critical(this,"Connection warning","<font color=\"White\">The remote is not connected to the amplifiers <br>Please check connection");
        msg.setStyleSheet("background-color:red");
        //msg.setStyleSheet("QMessageBox:{ background-color:red;}");

        // Set connection status led to red
        ui->stat_Label->setText("Not connected!");
        ui->stat_Label->setStyleSheet("color:red;");
    }

    else
    {
        ui->stat_Label->setText("Connected");
        ui->stat_Label->setStyleSheet("color:green;");
    }

}

I have managed to get the text white, but when it comes to the buttons of background I have tried some approaches but none have worked so far.

How can I make this happen?

[jsulm]

@frodi critical() is a static method - setting stylesheet on a QMessageBox instance and then calling a static method does not make sense (also, you set stylesheet after calling critical).