int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    auto button = new QPushButton("Button");
    QMenu* menu2 = new QMenu(button);
    menu2->addAction("Action 2");
    button->setMenu(menu2);
    button->setStyleSheet("QPushButton { background: white; color: black; padding: 6;}");
    button->show();
    return app.exec();
}