Update app.py

app.py

@@ -83,8 +83,8 @@ class ShadowTheHedgehog(Base):
             block_info_text_color="*neutral_400",
             block_info_text_size="*text_sm",
             block_info_text_weight="400",
-            block_label_background_fill="*neutral_900",
-            block_label_background_fill_dark="*neutral_900",
+            block_label_background_fill="#000000",
+            block_label_background_fill_dark="#000000",
             block_label_border_color="*neutral_700",
             block_label_border_width="1px",
             block_label_margin="0",