The iframed map uses the whole display available

app/assets/stylesheets/maps.sass

@@ -27,7 +27,7 @@ section.leaflet-control-layers-list label
     display: inline-block !important
     position: relative !important
 
-html.iframe #map
-  width: 100%
-  max-width: 100%
-  box-shadow: none
+html.iframe
+  &, body, main, #map
+    width: 100%
+    height: 100%