add color bar

[Mojganz]

I want to add a color bar for this code lake_image = sentinel2.median()

vis = {
'bands': ['B4', 'B3', 'B2'],
'min': 0,
'max': 900
}
Map = geemap.Map()

Map.centerObject(lake_7, 16)

Map.addLayer(lake_image, vis, 's2')

Display the map.

Map

I take a sentinel 2 image over a specific lake and map it. But I have a problem with showing color bar for my map
this is map of lake

[giswqs]

This is a geemap question. Post it at https://github.com/gee-community/geemap/discussions