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

.leaflet-cluster-spider-leg {
  /* stroke-dashoffset (duration and function) should match with leaflet-marker-icon transform in order to track it exactly */
  transition: stroke-dashoffset 0.3s ease-out, stroke-opacity 0.3s ease-in;
}