Update app.py

Add notification

app.py

@@ -84,6 +84,10 @@ def nav_controls(prefix: str) -> List[NavSetArg]:
                         ui.input_action_button("do_plot", "Plot", class_="btn-success"), 
                     ),
                     ui.panel_main(
+                        ui.span(
+                            "Please do not use the computer's touchscreen to zoom in on the map, as this can cause errors.",
+                            style="color: red;"
+                        ),
                         ui.div(
                             ui.strong("cloudCover(%)"),
                             ui.span(": The fraction of the sky obscured by clouds when observed from a particular location. The part with a red shadow in the figure indicates that the value is greater than or equal to 25%, and it is "),