Update app.py

app.py

@@ -13,6 +13,6 @@ with gr.Blocks() as app:
     format=gr.Dropdown(label="Line Format",choices=[m for m in list(mf.keys())])
     txt=gr.Textbox()
     btn=gr.Button()
-    prev=gr.Markdown()
+    prev=gr.Markdown("# test")
     btn.click(upd,[txt,format],prev)
 app.launch()