Adding drop shadow to grouped entries in Interactive Geo Maps

dropshadow.js

let mapID = 21169; // change with your map ID
let mapContainer = document.getElementById('map_' + mapID);
if(mapContainer){
    mapContainer.addEventListener('mapready',function(ev){
        iMaps.maps[mapID].series.forEach(function(serie){
            var filter = serie.filters.push(new am4core.DropShadowFilter());
            filter.color = am4core.color("#000000");
            filter.dx = 5;
            filter.dy = 5;
            filter.blur = 2;
            filter.opacity = 0.5;
        });
    });
}