Update app.py

app.py

@@ -97,7 +97,8 @@ demo = gr.ChatInterface(
         body_background_fill_dark="#16141c",
         block_background_fill_dark="#16141c",
         input_background_fill_dark="#292733",
-        button_secondary_background_fill_dark="#24212b"
+        button_secondary_background_fill_dark="#24212b",
+        border_color_primary_dark="#343140"
     ),
     css=css,
     retry_btn="Retry",