diff --git a/12/style.css b/12/style.css
index 716956e..79aadc3 100644
--- a/12/style.css
+++ b/12/style.css
@@ -643,6 +643,10 @@ filter: invert(1);
   color: #fff;
 }
 
+#shell_03header:hover{
+  z-index:1000;
+}
+
 #audio_05header{
   padding: 10px;
   cursor: move;