diff --git a/themes/afpy/templates/base.html b/themes/afpy/templates/base.html
index 3d9764b..f5c20f1 100644
--- a/themes/afpy/templates/base.html
+++ b/themes/afpy/templates/base.html
@@ -12,7 +12,7 @@
     {% endblock head %}
   </head>
 
-  <body>
+  <body id="page-{{ output_file.split('/')[-1].split('.')[0] }}">
     <header>
       <img src="/static/img/logo.svg" alt="AFPy logo">
       <h1><a href="/">AFPy</a></h1>
