diff --git a/12/style.css b/12/style.css
index 34a5e17..49f59be 100644
--- a/12/style.css
+++ b/12/style.css
@@ -276,7 +276,7 @@ a:hover{
   overflow: hidden;
 }
 
-#shell_03 iframe, iframe_04 {
+#shell_03 iframe{
   width: 100%;
   height: 100%;
   border: none;
@@ -435,7 +435,7 @@ a:hover{
   overflow: hidden;
 }
 
-#etherpad iframe, iframe_04 {
+#etherpad iframe {
   width: 100%;
   height: 100%;
   border: none;