diff --git a/12/style.css b/12/style.css
index e614995..961db52 100644
--- a/12/style.css
+++ b/12/style.css
@@ -224,6 +224,7 @@ display:none;
   width: 100%;
   height: 100%;
   border: none;
+  background-color: none;
 }
 
 #torusKnot {