Update app.py

app.py

@@ -162,7 +162,7 @@ description = """
   """
 
 # 6. Use Gradio to pull it all together
-with gr.Blocks(css = """#col_container {width: 640px; margin-left: auto; margin-right: auto;} #chatbot {height: 400px; overflow: auto;}""") as demo:
+with gr.Blocks(css = """#col_container {width: 100%; margin-left: auto; margin-right: auto;} #chatbot {height: 400px; overflow: auto;}""") as demo:
     gr.HTML(title)
     with gr.Column(elem_id = "col_container"):
         inputs = gr.Textbox(placeholder= "Hi there!", label= "Type an input and press Enter")