Update app.py

app.py

@@ -517,8 +517,8 @@ def server(input, output, session):
             "delay": 60,
             "delay_type": "throttle",
             "clip": True,  # This helps constrain the brush to the plot area
-            "fill": "#FFB00050",  # Optional: sets a semi-transparent fill
-            "stroke": "#FFB000",    # Resets brush when new data is loaded
+            "fill": "#00000050",  # Optional: sets a semi-transparent fill
+            "stroke": "#000000",    # Resets brush when new data is loaded
         }
             
         return ui.output_plot('plot',