diff --git a/app/views/catalog/_universal_viewer_default.html.erb b/app/views/catalog/_universal_viewer_default.html.erb
index daba177e6..cf0096f6b 100644
--- a/app/views/catalog/_universal_viewer_default.html.erb
+++ b/app/views/catalog/_universal_viewer_default.html.erb
@@ -4,7 +4,8 @@
                                                                        iiif_manifest(manifest_service:
                                                                                      Spotlight::ManifestService.new(document: document))
                                                                        %>&config=examples-config.json"
-    width:100%
+    width="560"
+    height="420"
     allowfullscreen
     frameborder="0">
 </iframe>