Update app.py

app.py

@@ -188,9 +188,10 @@ class RAGInterface:
         )
 
         # Wrap the interface with custom HTML
-        return gr.Blocks() as wrapped_demo:
+        with gr.Blocks(css=custom_css, html=header_html) as wrapper:
             gr.HTML(header_html)
             demo.render()
+        return wrapper
 
 def main():
     interface = RAGInterface()