dark mode toggle

app.py

@@ -426,6 +426,7 @@ with gr.Blocks(
                             show_label=False,
                             label="do_sample"
                         )
+                        toggle_dark = gr.Button(value="Toggle Dark Mode")
 
         # Right Column: Chat Interface
         with gr.Column(scale=2):
@@ -543,5 +544,14 @@ with gr.Blocks(
         outputs=control_checks + control_sliders
     )
 
+    toggle_dark.click(
+        None,
+        js="""
+        () => {
+            document.body.classList.toggle('dark');
+        }
+        """,
+    )
+
 if __name__ == "__main__":
     app.launch()