Update app.py

app.py

@@ -17,7 +17,8 @@ def generate_response(model_name, message, chat_history):
 with gr.Blocks(
     css=".contain { display: flex !important; flex-direction: column !important; }"
     "#chatbot { flex-grow: 1 !important; overflow: auto !important;}"
-    "#col { height: calc(100vh - 112px - 16px) !important; }"
+    "#col { height: calc(100vh - 112px - 16px) !important; }",
+    theme=gr.themes.Default(primary_hue=gr.themes.colors.green)
 ) as demo:
     gr.Markdown("# GPT4All Chatbot")
     with gr.Row():