Update app.py

app.py

@@ -22,8 +22,8 @@ with gr.Blocks(
     # "#submit:hover { background-color: green !important; }"
     # "#clear { background-color: darkred !important; }",
     theme=gr.themes.Soft(font=[gr.themes.GoogleFont("Martel Sans")]).set(
-    button_cancel_background_fill_hover_dark='darkred',
-    button_cancel_background_fill_hover='darkred'
+    *button_cancel_background_fill_hover_dark='darkred',
+    *button_cancel_background_fill_hover='darkred'
     )                   
 ) as demo:
     gr.Markdown("# GPT4All Chatbot")