update application file

app.py

@@ -16,7 +16,7 @@ with gr.Blocks() as demo:
             y=-20,  # Above the button
             value="Top Button"
         )
-        out = gr.Textbox()
+        out = "Hello World"
         inp.click(button_click, inp, out)
 
 if __name__ == "__main__":