def service_usage_graph(n_clicks):
    return get_tweets()
              className='one-half column'),
 ],
          className='container'),
 html.Div([
     html.Div([
         html.Div([
             html.Div([
                 html.Strong('LIVE TWEETS',
                             id='tweet-title',
                             className='titles',
                             style={'float': 'left'}),
                 html.Button(['REFRESH'],
                             id='refresh-button',
                             className='two columns'),
             ]),
             html.Div([get_tweets()], id='tweet-container')
         ],
                  className='eight columns',
                  id='tweet-display'),
         html.Div([
             html.Strong('TWEET POLARITY', className='titles'),
             html.Div([
                 dcc.Graph(id='polarity-pie-chart',
                           figure=generate_pie_chart())
             ])
         ],
                  className='four columns',
                  id='tweet-polarity-display')
     ],
              className='container'),
 ],