diff --git a/css/skeleton.css b/css/skeleton.css
index ee853d3..45994a8 100644
--- a/css/skeleton.css
+++ b/css/skeleton.css
@@ -176,7 +176,7 @@ a:hover {
 –––––––––––––––––––––––––––––––––––––––––––––––––– */
 
 summary {
-  margin-top: .5em
+  margin-top: .5em;
   margin-bottom: .5rem;
 }
 summary:hover {