Styling folium (Leaflet) tooltips

html_tooltips.py

import folium

# Map pointing at Cape Town
m = folium.Map(
    location=[-33.918861, 18.423300],
    zoom_start=12
)

# HTML Div with style information
desc_html = f'<div style="white-space: normal"> This is a line,<br> this is another line </div>'

# Adding it to the map via a Transparent Rectangle
folium.vector_layers.Rectangle(
  bounds=[[-33.90916303, 18.388831778], [-34.075691, 18.843266]],
  fill=True,
  opacity=0,
  fill_opacity=0,
  tooltip=folium.map.Tooltip(
      # note that the width still has to be set on the HTML object is still set
      text=folium.Html(desc_html, script=True, width=300).render(),
  )
).add_to(m)

m