Update app.py

app.py

@@ -76,7 +76,7 @@ def respond(message, history):
 
 custom_css = """
 .gradio-container {
-    background-color: #ccccff; /* light purple */
+    background-color: #d6d1e5; /* light purple */
 }
 .message.bot {
     background-color: #ff99cc; /* pink */