Qt QFrame StyleSheet not working in MainWindow - c++

Question

I am struggling with a basic StyleSheet question. I am trying to apply a stylesheet to a QFrame within a MainWindow, and for some reason, the stylesheet is being ignored. This seems related to Qt Stylesheet for custom widget and Enable own widget for stylesheet, but I've tried adding a paintEvent and that did not help. Its gotta be something simple, but I can't see it. Can anyone help?
main.cpp:
#include <QApplication>
#include <QDebug>
#include "mainwindow.h"
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
MainWindowDef mainWindow;
mainWindow.show();
return app.exec();
}
mainwindow.h:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QtWidgets>
class MainWindowDef : public QMainWindow {
Q_OBJECT
public:
MainWindowDef(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *);
};
#endif
mainwindow.cpp:
#include <QDebug>
#include "mainwindow.h"
MainWindowDef::MainWindowDef(QWidget *parent) : QMainWindow(parent) {
QFrame *frame = new QFrame;
QVBoxLayout *layout = new QVBoxLayout;
QPushButton *button = new QPushButton("Press");
layout->addWidget(button);
QString myStyle = QString( "QFrame {"
"border: 2px solid green;"
"border-radius: 4px;"
"padding: 2px"
"background-color: red;"
"color: blue;"
"}");
frame->setStyleSheet(myStyle);
frame->setLayout(layout);
frame->setAutoFillBackground(true);
setCentralWidget(frame);
}
void MainWindowDef::paintEvent(QPaintEvent *)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}

Answer 1

I finally figured this out. It was missing a semicolon.
"padding: 2px"
should say:
"padding: 2px;"
Sigh.