arker. */
                el.id = `marker-${marker.properties.id}`;
                /* Assign the `marker` class to each marker for styling. */
                el.className = 'marker';

                /**
                 * Create a marker using the div element
                 * defined above and add it to the map.
                 **/
                new mapboxgl.Marker(el, {
                        offset: [0, -23]
                    })
                    .setLngLat(marker.geometry.coordinates)
      