diff --git a/12/style.css b/12/style.css
index d89200e..4fa9274 100644
--- a/12/style.css
+++ b/12/style.css
@@ -495,7 +495,7 @@ a:hover{
   	width: 100%;
 }
 
-etherpad_drag.hidden {
+#etherpad_drag.hidden {
 	display:none;
     overflow: hidden;
 }