private static void createAndShowGUI() {

        JFrame frame = new JFrame("My App");

        GridLayout myLayout = new GridLayout(1,2);
        myLayout.setHgap(10);

        frame.setLayout(myLayout);

        JPanel  jLeftPanel = new JPanel();
        JPanel  jRightPanel = new JPanel();

        jLeftPanel.setBackground(Color.DARK_GRAY);
        jLeftPanel.setSize(275, 250);

        jRightPanel.setBackground(Color.DARK_GRAY);
        jRightPanel.setSize(275, 250);

        frame.add(jLeftPanel);
        frame.add(jRightPanel);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//        frame.pack();
        frame.setSize(600, 550);
        frame.setVisible(true);
    }