JPanel formPanel2 = new JPanel();
JLabel label2 = new JLabel();
label2.setText("<html><p style='color:red;padding:10px 15px;text-align:center;'>Важно съобщение!</p></html>");
label2.setHorizontalAlignment(SwingConstants.CENTER);
label2.setFont(new Font("Arial", 0, 16));
add(label2, BorderLayout.NORTH);