Change color of all or some markers with scatter_mapbox

📊 Plotly Python
1

Hi, I am a bit lost with trying to change all the color points to let’s say red. Or only the one in Australia to yellow.
How would I do this?

Thank you very much in advanced!

import plotly.express as px
import geopandas as gpd

geo_df = gpd.read_file(gpd.datasets.get_path('naturalearth_cities'))

px.set_mapbox_access_token(open(".mapbox_token").read())
fig = px.scatter_mapbox(geo_df,
                        lat=geo_df.geometry.y,
                        lon=geo_df.geometry.x,
                        hover_name="name",
                        zoom=1)
fig.show()