Update theme

app.py

@@ -101,6 +101,6 @@ gr.Interface(decide,
              outputs='text',
              examples=examples,
              title="Sentiment analysis of product reviews",
-             theme="grass", description=description,
+             theme="gradio/monochrome", description=description,
              allow_flagging="auto",
              flagging_dir='flagging records').launch(enable_queue=True, inline=False)