diff --git a/umap/static/umap/vendors/markercluster/MarkerCluster.Default.css b/umap/static/umap/vendors/markercluster/MarkerCluster.Default.css
index bbc8c9fb..a453b206 100755
--- a/umap/static/umap/vendors/markercluster/MarkerCluster.Default.css
+++ b/umap/static/umap/vendors/markercluster/MarkerCluster.Default.css
@@ -48,7 +48,7 @@
 .marker-cluster div {
 	width: 30px;
 	height: 30px;
-	margin-left: 5px;
+	margin-inline-start: 5px;
 	margin-top: 5px;
 
 	text-align: center;
@@ -57,4 +57,4 @@
 	}
 .marker-cluster span {
 	line-height: 30px;
-	}
\ No newline at end of file
+	}