Update to site

source/_includes/custom/after_footer.html

@@ -0,0 +1,24 @@
+{% comment %}
+  Add content to be output at the bottom of each page. (You might use this for analytics scripts, for example)
+{% endcomment %}
+<script>
+  $(document).ready(function() {  
+  var stickyNavTop = $('nav').offset().top;  
+    
+  var stickyNav = function(){  
+  var scrollTop = $(window).scrollTop();  
+         
+  if (scrollTop > stickyNavTop) {   
+      $('nav').addClass('sticky');  
+  } else {  
+      $('nav').removeClass('sticky');   
+  }  
+  };  
+    
+  stickyNav();  
+    
+  $(window).scroll(function() {  
+      stickyNav();  
+  });  
+  });  
+</script>