diff --git a/htdocs/samples/chart_bar_stacked.html b/htdocs/samples/chart_bar_stacked.html
index 9713c56..ab7db41 100644
--- a/htdocs/samples/chart_bar_stacked.html
+++ b/htdocs/samples/chart_bar_stacked.html
@@ -1,33 +1,33 @@
 <html>
-<head>
+  <head>
     <link href="/css/c3.css" rel="stylesheet" type="text/css">
-</head>
-<body>
-<div id="chart"></div>
+  </head>
+  <body>
+    <div id="chart"></div>
 
     <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
-<script src="/js/c3.js"></script>
-<script>
-    var chart = c3.generate({
+    <script src="/js/c3.js"></script>
+    <script>
+      var chart = c3.generate({
         data: {
-            columns: [
-                ['data1', 30, 200, 200, 400, 150, 250],
-                ['data2', 130, -100, 100, 200, 150, 50]
-            ],
-            types: {
-                data1: 'bar',
-                data2: 'bar'
-            },
-            groups: [
-                ['data1', 'data2']
-            ]
+          columns: [
+            ['data1', 30, 200, 200, 400, 150, 250],
+            ['data2', 130, -100, 100, 200, 150, 50]
+          ],
+          types: {
+            data1: 'bar',
+            data2: 'bar'
+          },
+          groups: [
+            ['data1', 'data2']
+          ]
         },
         axis: {
           x: {
             type: 'categorized'
           }
         }
-    });
-</script>
-</body>
+      });
+    </script>
+  </body>
 </html>
