diff --git a/semag/sb2toswf/index.html b/semag/sb2toswf/index.html
index 4718ec2e..a37c1d83 100644
--- a/semag/sb2toswf/index.html
+++ b/semag/sb2toswf/index.html
@@ -6,10 +6,11 @@
 
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>Scratch 2 to Flash</title>
-    <style>html{background-color:#000;}</style>
+    <style>html{background-color:#fff;}</style>
   </head>
   <body>
-    <div id="ruffle" width="100%" height="100%"></div>
+    <center>
+    <div id="ruffle" width="100%" height="100%"></div></center>
     <script src="https://unpkg.com/@ruffle-rs/ruffle"></script>
     <script>
       window.RufflePlayer = window.RufflePlayer || {};
