Update app.py

app.py

@@ -130,15 +130,8 @@ def set_visible_true():
 
 theme_addon_msg = ""
 system_msg_info = ""
-theme = gr.themes.base()
-
-with gr.Blocks(css="""
-#col_container { margin-left: auto; margin-right: auto; background-color: #f0f0f0; }
-#chatbot { height: 450px; overflow: auto; background-color: #ffffff; }
-#chatbot .chat-message { border-bottom: 1px solid #e0e0e0; padding: 10px; }
-#chatbot .chat-message.user { background-color: #e0ffe0; }
-#chatbot .chat-message.assistant { background-color: #e0e0ff; }
-""", theme=theme) as demo:
+theme = gr.themes.Base()
+with gr.Blocks(theme=theme) as demo:
     with gr.Column(elem_id="col_container"):
         with gr.Accordion("", open=False, visible=False):
             system_msg = gr.Textbox(value="")