final JLabel cell = new JLabel(kana.getUnicodeString(), JLabel.CENTER);
cell.setFont(Fonts.kanaMedium());
cell.setBorder(BorderFactory.createEtchedBorder());
cell.setAlignmentX(0.5f);
cell.setAlignmentY(0.5f);
cell.addMouseListener(new MouseAdapter() {
final Border border = cell.getBorder();
@Override
public void mousePressed(MouseEvent mouseEvent) {
if (mouseEvent.getButton() == MouseEvent.BUTTON1) {
if (!kana.matches(tiles.kana)) {