moved the starting square to surround an area which features the pmtile data.

app.py

@@ -50,7 +50,7 @@ m.add_pmtiles(
 )
 
 
-polygon_ex ='{"type":"Feature","properties":{},"geometry":{"type":"Polygon","coordinates":[[[-124.628906,34.741612],[-124.628906,42.423457],[-117.246094,42.423457],[-117.246094,34.741612],[-124.628906,34.741612]]]}}'
+polygon_ex ='{"type":"Feature","properties":{},"geometry":{"type":"Polygon","coordinates":[[[-6.108398,40.780541],[-6.108398,54.342149],[15.908203,54.342149],[15.908203,40.780541],[-6.108398,40.780541]]]}}'
 code_ex = '''
 m.add_gdf(geo, layer_name="selection")
 '''