Update app.py

app.py

@@ -517,7 +517,7 @@ def server(input, output, session):
             "delay": 60,
             "delay_type": "throttle",
             "clip": True,  # This helps constrain the brush to the plot area
-            "fill": "#FFB00033",  # Optional: sets a semi-transparent fill
+            "fill": "#FFB00050",  # Optional: sets a semi-transparent fill
             "stroke": "#FFB000",    # Resets brush when new data is loaded
         }