Update app.py

app.py

@@ -79,7 +79,7 @@ custom_css = """
     background-color: #d6d1e5; /* light purple */
 }
 .message.bot {
-    background-color: ##ffc6cc; /* pink */
+    background-color: #ffc6cc; /* pink */
     color: #1e3a8a; 
 }
 .message.user {