demo.html in futuro-0.1.9

- old
+ new

@@ -1,10 +1,10 @@
 <!DOCTYPE html>
 <html lang="{{ page.lang | default: site.lang | default: "en" }}">
 
   {% include html/head.html %}
 
-  <body>
+  <body class="{% if page.demo %}{{ page.demo | prepend: '_demo-' }}{% endif %}">
 
     {% include html/overlay.html title='load' state='open' demo='true' %}
 
     <div class="site">
 