message: Hide mouse cursor in kiosk mode
diff: <script type="text/javascript" src="socketio/socket.io.min.js"></script>
  <script data-main="kiosk" src="require/require.js"></script>
  <style>
  + body { cursor: none; }
  +
  .minigui {
  display: flex;
  flex-wrap: wrap;
  