adding css

Chatbot.py

@@ -44,7 +44,7 @@ class Model:
             max_tokens=None,
             timeout=None,
             max_retries=2,
-            google_api_key = "GOOGLE_API_KEY"
+            google_api_key = os.getenv("GOOGLE_API_KEY")
         )
 
         # Define Prompt Template
@@ -138,7 +138,7 @@ class ChatInterface:
     def get_chat_history(self, user_id):
         return MongoDBChatMessageHistory(
             session_id=user_id,
-            connection_string="Mongo_URI",
+            connection_string= os.getenv("Mongo_URI"),
             database_name="Chatbot",
             collection_name="chat_histories",
         )