old_contents: '''Startup screen
  '''
  
  from kivy.uix.screenmanager import Screen
  from kivy.lang import Builder
  
  
  class StartupScreen(Screen):
      '''
      '''
      Builder.load_string('''
  <SingleLineLabel@Label>
      text_size: self.size
      size_hint_y: None
      height: '45dp'
  <Background@Widget>
      source: ''
      color: app.base_color
      canvas.before:
          Color:
              rgba: root.color if root.color else (1, 1, 1, 1)
          Rectangle:
              source: root.source
              size: self.size
              pos: self.pos
  
  
  <StartupScreen>
      name: 'StartupScreen'
      on_enter:
          from kivy.animation import Animation
          Animation(d=.5, width=self.width, top=self.height, height=self.height/2).start(img_logo)
          Animation(d=.5, width=self.width, top=self.height/2, height=self.height/2).start(img_venue)
          from kivy.clock import Clock
          Clock.schedule_once(lambda dt: app.load_screen('NavigationScreen'), 2)
      Background:
          color: app.base_color
          source: 'atlas://data/default/bg'
      Image
          id: img_venue
          source: 'atlas://data/default/venue'
          size_hint_y: None
      Image
          id: img_logo
          source: 'atlas://data/default/logo'
          size_hint_y: None
  ''')
      
new_contents: '''Startup screen
  '''
  
  from kivy.uix.screenmanager import Screen
  from kivy.lang import Builder
  
  
  class StartupScreen(Screen):
      '''
      '''
      Builder.load_string('''
  <SingleLineLabel@Label>
      text_size: self.size
      size_hint_y: None
      height: '45dp'
  <Background@Widget>
      source: ''
      color: app.base_color
      canvas.before:
          Color:
              rgba: root.color if root.color else (1, 1, 1, 1)
          Rectangle:
              source: root.source
              size: self.size
              pos: self.pos
  <LeftAlignedLabel@SingleLineLabel>
      halign: 'left'
  
  <StartupScreen>
      name: 'StartupScreen'
      on_enter:
          from kivy.animation import Animation
          Animation(d=.5, width=self.width, top=self.height, height=self.height/2).start(img_logo)
          Animation(d=.5, width=self.width, top=self.height/2, height=self.height/2).start(img_venue)
          from kivy.clock import Clock
          Clock.schedule_once(lambda dt: app.load_screen('NavigationScreen'), 2)
      Background:
          color: app.base_color
          source: 'atlas://data/default/bg'
      Image
          id: img_venue
          source: 'atlas://data/default/venue'
          size_hint_y: None
      Image
          id: img_logo
          source: 'atlas://data/default/logo'
          size_hint_y: None
  ''')
      
subject: Add LeftAlignedLabel class