diff --git a/12/style.css b/12/style.css
index 6460181..d89200e 100644
--- a/12/style.css
+++ b/12/style.css
@@ -488,7 +488,7 @@ a:hover{
   z-index:1000;
 }
 
-etherpad_iframe{
+.etherpad_iframe{
   display: inline-block;
   position: relative;
 	height: 100%;