diff --git a/test.html b/test.html
index 16024b9..3c5752c 100644
--- a/test.html
+++ b/test.html
@@ -21,6 +21,7 @@ iframe{
   width: 8.5in;
   border:none;
   display:block;
+  margin: auto;
 }
 
 iframe {text-align: center;}