Update app.py

app.py

@@ -309,12 +309,16 @@ with gr.Blocks(theme='gradio/soft') as demo:
                 toggle_dark = gr.Button(value="Toggle Dark")
 
     toggle_dark.click(
-        None,
-        _js="""
-        () => {
+        fn=toggle_dark_mode,  # This can be None if no Python function is needed
+    )
+    
+    demo.js(
+        """
+        toggleDarkButton = document.querySelector('button[value="Toggle Dark"]');
+        toggleDarkButton.addEventListener('click', () => {
             document.body.classList.toggle('dark');
-        }
-        """,
+        });
+        """
     )
     with gr.Tab("Methodology"):
         gr.Markdown("""