wip: bigger cluster icon

Co-authored-by: David Larlet <david@larlet.fr>

Author: yohanboniface

umap/static/umap/js/modules/rendering/icon.js

@@ -257,7 +257,7 @@ const Ball = DefaultIcon.extend({
 
 export const Cluster = DivIcon.extend({
   options: {
-    iconSize: [32, 32],
+    iconSize: [40, 40],
     className: 'umap-cluster-icon',
   },
 

umap/static/umap/map.css

@@ -1042,14 +1042,11 @@ a.umap-control-caption,
 
 .umap-cluster-icon {
     border-radius: 50%;
-    height: 32px;
-    width: 32px;
-    margin-left: -16px;
-    margin-top: -16px;
     border: 4px solid white;
     display: flex;
     justify-content: center;
     align-items: center;
+    font-weight: bold;
 }
 
 /* ********************************* */