text: """
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
  """
  
  import remi.gui as gui
  from remi import start, App
  
  
  class MyApp(App):
      def __init__(self, *args):
          super(MyApp, self).__init__(*args)
  
      def main(self):
          wid = gui.VBox(width=300, height=200, margin='0px auto')
          self.lbl = gui.Label('Press the button', width='80%', height='50%')
          self.lbl.style['margin'] = 'auto'
          self.bt = gui.Button('Press me!', width=200, height=30)
          self.bt.style['margin'] = 'auto 50px'
  
          # setting the listener for the onclick event of the button
          self.bt.onclick.connect(self.on_button_pressed)
  
          # appending a widget to another, the first argument is a string key
          wid.append(self.lbl)
          wid.append(self.bt)
  
          # returning the root widget
          return wid
  
      # listener function
      def on_button_pressed(self, widget):
          self.lbl.set_text('A notification message should appear.')
          self.bt.set_text('Hi!')
          self.notification_message("Message title", "Hello world!", "")
  
  
  if __name__ == "__main__":
      # starts the webserver
      # optional parameters
      # start(MyApp,address='127.0.0.1', port=8081, multiple_instance=False,enable_file_cache=True, update_interval=0.1, start_browser=True)
      start(MyApp, debug=True, address='0.0.0.0', port=0, )
  