Update app.py

app.py

@@ -23,9 +23,9 @@ with gr.Blocks(
         text_size="lg"
     ).set(
         background_fill_primary='*neutral_200',
-        background_fill_primary_dark='secondary_200',
+        background_fill_primary_dark='neutral_500',
         background_fill_secondary='neutral_100',
-        background_fill_secondary_dark='gray',
+        background_fill_secondary_dark='secondary_400',
         border_color_accent='*secondary_400',
         border_color_accent_dark='*secondary_800',
         color_accent='*secondary_600',