diff --git a/devday-rx.css b/devday-rx.css
index 4f283c5..626dbd9 100644
--- a/devday-rx.css
+++ b/devday-rx.css
@@ -5,9 +5,9 @@ body { font-family : Helvetica, Arial, Courier;
       }     
 sidebar { position:absolute; left:520px; top:20px; padding : 10px;}
 #links { margin-top : 15px;}
-#arena { width: 200px; height: 200px;}
 h1 { margin-top: 20px; }
 pre { color: #0f0; background: #000; text-align: left; padding: 10px; }
 #content { float : left; width: 60%; margin-bottom: 10px;}
 #src { clear : both; }
-#demo { float : left; width : 30%; margin: 10px;}
+#demo { float : left; width : 200px; height: 200px; margin: 10px; 
+        background: #222;}