Update app.py

app.py

@@ -195,7 +195,7 @@ with gr.Blocks(css="""
     }
 
     .message.bot {
-        background-color: #99ccff !important;   /* Lighter blue */
+        background-color: #5599ff !important;   /* Lighter blue */
         color: #000000 !important;
         border-radius: 10px !important;
         padding: 10px;