source: binary-improvements/webserver/leaflet/markercluster/MarkerCluster.css@ 216

.leaflet-cluster-anim .leaflet-marker-icon, .leaflet-cluster-anim .leaflet-marker-shadow {
        -webkit-transition: -webkit-transform 0.3s ease-out, opacity 0.3s ease-in;
        -moz-transition: -moz-transform 0.3s ease-out, opacity 0.3s ease-in;
        -o-transition: -o-transform 0.3s ease-out, opacity 0.3s ease-in;
        transition: transform 0.3s ease-out, opacity 0.3s ease-in;
        }