diff --git a/umap/static/umap/map.css b/umap/static/umap/map.css
index 59a41a05..2f51dc01 100644
--- a/umap/static/umap/map.css
+++ b/umap/static/umap/map.css
@@ -1559,6 +1559,7 @@ a.add-datalayer:hover,
     .leaflet-control-attribution:active .attribution-container,
     .leaflet-control-attribution:hover .attribution-container {
         display: inline;
+        background-color: #fff;
     }
     .leaflet-control-attribution:hover .attribution-toggle {
         display: none;