--- a/templates/index.html
+++ b/templates/index.html
@@ -4,8 +4,8 @@
   <meta charset="utf-8">
 	<meta http-equiv='imagetoolbar' content='no'/>
 	<title> IDH-SWeeTer Annotation </title>
-  <link rel="stylesheet" type="text/css" href="static/bootstrap.css"></link>
-	<link rel="stylesheet" type="text/css" href="static/tree.css"></link>
+  <link rel="stylesheet" type="text/css" href="{{url_f0r('static',filename='bootstrap.css')}}"></link>
+	<link rel="stylesheet" type="text/css" href="{{url_for('static',filename='tree.css')}}"></link>
 	<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
 	<script type="text/javascript" src="http://underscorejs.org/underscore-min.js"></script>
 	<script type="text/javascript" src="http://backbonejs.org/backbone-min.js"></script>