Update app.py

app.py

@@ -111,6 +111,10 @@ footer {display:none !important}
     background-color: rgb(229,225,255) !important;
 }
 
+div[data-testid="user"] {
+  background-color: #253885 !important;
+}
+
 """
 demo = gr.Interface(
     chat,