Update app.py

Add notification

app.py

@@ -195,7 +195,9 @@ app_ui = ui.page_fluid(
         ui.br(),
         ui.strong("If you are unable to zoom in or out of the map using the mouse scroll wheel, please use the slide bar provided above to zoom directly.", style="color: green;"),
         ui.br(),
-        ui.strong("We strongly recommend that you use a smaller scale to view the heat map (17 or 18 zoom level), as it will retain more details.", style="color: red;")
+        ui.strong("We strongly recommend that you use a smaller scale to view the heat map (17 or 18 zoom level), as it will retain more details.", style="color: red;"),
+        ui.br(),
+        ui.strong("Please do not use the computer's touchscreen to zoom in on the map, as this can cause errors.", style="color: red;")
     ),
     ui.layout_sidebar(
         ui.panel_sidebar(