JAVASCRIPT

leaflet marker cluster change color

.marker-cluster-small {
background-color: rgba(218, 94, 94, 0.6);
}
.marker-cluster-small div {
background-color: rgba(226, 36, 36, 0.6);
}
.marker-cluster-medium {
background-color: rgba(241, 211, 87, 0.6);
}
.marker-cluster-medium div {
background-color: rgba(240, 194, 12, 0.6);
}

.marker-cluster-large {
background-color: rgba(253, 156, 115, 0.6);
}
.marker-cluster-large div {
background-color: rgba(241, 128, 23, 0.6);
}

leaflet marker cluster change color

iconCreateFunction: function (cluster) {
 var childCount = cluster.getChildCount();
 var c = ' marker-cluster-';
 if (childCount < 10) {
   c += 'small';
 } 
 else if (childCount < 100) {
   c += 'medium';
 } 
 else {
   c += 'large';
 }

 return new L.DivIcon({ html: '<div><span>' + childCount + '</span></div>', 
  className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });
 }