I have the following code which should render a choropleth map.

import plotly.express as px
import geopandas as gpd
 
# Example GeoJSON file with polygon geometries
geojson_file = 'example.geojson'
 
# Read GeoJSON file into GeoDataFrame
*** = gpd.read_file(geojson_file)
 
# Create Mapbox GL plot
fig = px.choropleth_mapbox(
    ***, 
    geojson=***.geometry, 
    locations=***.index, 
    color='property',
    center=dict(lat=0, lon=0), 
    zoom=1,
    mapbox_style="carto-positron"
)
 
fig.update_layout(margin=dict(l=0, r=0, t=0, b=0))
fig.show()

however, when I run the code in jupyter notebook, I get a blank output. Map doesn't render.