GoBlog/leaflet/markercluster.css

.leaflet-cluster-anim .leaflet-marker-icon,.leaflet-cluster-anim .leaflet-marker-shadow{-webkit-transition:-webkit-transform .3s ease-out,opacity .3s ease-in;-moz-transition:-moz-transform .3s ease-out,opacity .3s ease-in;-o-transition:-o-transform .3s ease-out,opacity .3s ease-in;transition:transform .3s ease-out,opacity .3s ease-in}.leaflet-cluster-spider-leg{-webkit-transition:-webkit-stroke-dashoffset .3s ease-out,-webkit-stroke-opacity .3s ease-in;-moz-transition:-moz-stroke-dashoffset .3s ease-out,-moz-stroke-opacity .3s ease-in;-o-transition:-o-stroke-dashoffset .3s ease-out,-o-stroke-opacity .3s ease-in;transition:stroke-dashoffset .3s ease-out,stroke-opacity .3s ease-in}