Update app.py

app.py

@@ -164,8 +164,8 @@ def generate_chat_display(history):
     <style>
         .chat-container { max-width: 600px; margin: auto; }
         .message { margin: 10px 0; padding: 10px; border-radius: 10px; width: 80%; color: #000000; }
-        .bot-message { background-color: #e6f3ff; float: left; clear: both; }
-        .user-message { background-color: #d4edda; float: right; clear: both; }
+        .bot-message { background-color: #3A3B3C; float: left; clear: both; }
+        .user-message { background-color: #192734; float: right; clear: both; }
     </style>
     <div class='chat-container'>
     """