Why the popup is not visisble in the map ?

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Python3.6

Hey what,s up i am trying to make a map through the library of folium but i am not getting the popup visible



Here is the code

import folium

import pandas

data = pandas.read_csv("makers.csv")

lat = list(data["LAT"])

lon = list(data["LON"])

elev = list(data["ELEV"])

map1 = folium.Map(location = [38.58, -99.09],tiles = "Mapbox Bright",zoom_start = 6 )

f = folium.FeatureGroup(name = "My map")


def color_picker(elevation):
if elevation < 1000:
return "green"

elif elevation >= 1000 and elevation <= 3000:
return "orange"

else:
return "red"

for lt, ln, el in zip(lat, lon, elev):
f.add_child(folium.CircleMarker(location=[lt, ln], popup=str(el),

icon = folium.Icon(color = color_picker(el) )))

map1.add_child(f)

map1.save("Map1.html")

What I have tried:

I tried to find the solution on internet. But maybe i have missed something ..