diff --git a/umap/static/umap/map.css b/umap/static/umap/map.css
index cd7f08d3..c10c2d2b 100644
--- a/umap/static/umap/map.css
+++ b/umap/static/umap/map.css
@@ -1456,6 +1456,9 @@ a.add-datalayer:hover,
     .umap-permanent-credits-container {
         max-width: 100%;
     }
+    .umap-popup-large iframe {
+        min-width: 300px;
+    }
 }
 
 /* ****** */