I am trying to remove the borders in a plotly choropleth map, but I can't find the property to do this.
fig = px.choropleth(df, geojson=counties, locations='fips', color=d2, template="ggplot2", scope="usa")
Results in a map that looks like the image below. I'm trying to remove the hard black borders. How can I do this?

fig.update_traces(marker_line_width=0, marker_opacity=0.1)- Baron Legendre