@Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setPaint(new LinearGradientPaint(0.0f, 0.0f, 0.0f, 50.0f,
                new float[] { 0.0f, 0.499f, 0.5f, 1.0f },
                new Color[] { new Color(0x63a5f7),
                              new Color(0x3799f4),
                              new Color(0x2d7eeb),
                              new Color(0x30a5f9) }));

        g2d.fillRect(0, 0, getWidth(), getHeight());
        super.paintComponent(g);
    }