Adding css versions.

css/main.css

     background: #e9e9e9;
 }
 
-
 #videospace {
     display: block;
     position: absolute;

index.html

     <script src="estos_log.js"></script><!-- simple stanza logger -->
     <script src="app.js"></script><!-- application logic -->
     <link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
-    <link rel="stylesheet" type="text/css" media="screen" href="css/main.css" />
-    <link rel="stylesheet" href="css/jquery-impromptu.css">
-    <link rel="stylesheet" href="css/modaldialog.css">
+    <link rel="stylesheet" type="text/css" media="screen" href="css/main.css?v=1"/>
+    <link rel="stylesheet" href="css/jquery-impromptu.css?v=1">
+    <link rel="stylesheet" href="css/modaldialog.css?v=1">
     <script src="libs/jquery-impromptu.js"></script>
     <script src="libs/jquery.autosize.js"></script>
     <script src="config.js"></script><!-- adapt to your needs, i.e. set hosts and bosh path -->