diff --git a/themes/red/assets/css/site.css b/themes/red/assets/css/site.css
index e5ebeb3..8178537 100644
--- a/themes/red/assets/css/site.css
+++ b/themes/red/assets/css/site.css
@@ -210,3 +210,7 @@ table {
 h2 {
     margin-top: 0.2em;
 }
+
+iframe {
+    border: 1px solid gray;
+}