Update app.py

app.py

@@ -42,6 +42,7 @@ def respond(
 """
 For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface
 """
+textbox_css = {"border": "2px solid black"}  # Customize the border style here
 demo = gr.ChatInterface(
     respond,
     additional_inputs=[