title: Color intersection leaflet circle
body: <p>I have a question about leaflet/folium. I have multiple circles on a map.
  All these circles does have some overlap with each other.
  Wat I want to do is to draw a line/Polygon in a different color, where all circles meet (intersection).</p>
  <p>This is an <a href="https://i.stack.imgur.com/8X7EJ.jpg" rel="nofollow noreferrer">example</a> of what I want to achieve. The blue line is the intersection and need a different color. Is this possible in folium or in pure leaflet? If so, how do I do that?</p>