title: Mapbox,leaflet: Increase marker size on Zoom
body: <p>How can I increase the size of all  markers when we zoom in the map?
  I know we can use <code>map.on('zoomend', function() {});</code> and change the icon size inside the function.But I have a lot of markers and looping through all of them and changing them individually doesn't seem like a good idea. </p>