@Override
        public void paintComponent(Graphics g)
        {
            g.setColor(background);
            g.fillRoundRect(0, 5, getWidth(), getHeight() - 10, 30, 30);
            g.setColor(foreground);
            g.drawString(text, (getWidth() - 50) / 2, (getHeight() - 10) / 2); // ƶλûı
        }