Fix black screen: remove MutationObserver freeze

app.py

@@ -166,7 +166,7 @@ demo = gr.Blocks(
     head=eval_countdown_head_js(),
 )
 with demo:
-    gr.HTML(TITLE)
+    gr.Markdown(f"# {TITLE.strip()}")
     gr.Markdown(INTRODUCTION_TEXT, elem_classes="markdown-text")
     status = gr.Markdown(INITIAL_OUTPUTS[2], elem_classes="markdown-text")
     countdown = gr.HTML(INITIAL_OUTPUTS[3])