diff --git a/12/style.css b/12/style.css
index 0b1d32c..e614995 100644
--- a/12/style.css
+++ b/12/style.css
@@ -216,9 +216,9 @@ a:hover{
   	margin-bottom: 20px;
 }
 
-/*#shell_03.hidden {
+#shell_03.hidden {
 display:none;
-}*/
+}
 
 #shell_03 iframe {
   width: 100%;