Fix dark mode background

src/app.py

@@ -238,7 +238,9 @@ with gr.Blocks(
         # block_title_text_weight=500,
         # block_label_text_weight=500,
         block_label_background_fill="white",
+        block_label_background_fill_dark="transparent",
         block_title_background_fill="white",
+        block_title_background_fill_dark="transparent",
         block_label_border_color="white",
         button_primary_background_fill=ibm_blue.c950,
     ),