diff --git a/combo/public/static/js/combo.public.js b/combo/public/static/js/combo.public.js
index 409c4b3d..e7f19e94 100644
--- a/combo/public/static/js/combo.public.js
+++ b/combo/public/static/js/combo.public.js
@@ -214,6 +214,15 @@ $(function() {
       return false;
   });
 
+  /* add a scrolled class to body once the user scrolled the page a bit */
+  $(window).on('scroll', function() {
+    if ($(window).scrollTop() == 0) {
+      $('body').removeClass('scrolled');
+    } else {
+      $('body').addClass('scrolled');
+    }
+  });
+
   $('body').on('click', 'a.calchunk', function(event){
       event.preventDefault();
       var $elem = $(this);