              <li>
                            <a href="./simple.html">Print button</a>
                        </li>
                        <li>
                            <a href="./message.html">Custom message</a>
                        </li>
                        <li class="active">
                            <a href="./columns.html">Export options - column selector</a>
                        </li>
                        <li>
                            <a href="./select.html">Export options - r