<td>
                <input type="text" id="contact_size" name="contact_size" value="18" oninput="badge_updated()">
            </td>
            <td>
                <input type="text" id="contact_color" name="contact_color" value="#000" oninput="badge_updated()">
            </td>
        </tr>
    </table>

    <p>
        <button onclick="send_to_badge()">Send to Badge</button>
    </p>
</div>
<script>
    window.onload = function () {
        if(check_serial()) {
            badge_updated();
        }
