diff --git a/docs/_includes/footer.html b/docs/_includes/footer.html
index d466e1f869..32305cb7cb 100644
--- a/docs/_includes/footer.html
+++ b/docs/_includes/footer.html
@@ -59,6 +59,15 @@ SimpleJekyllSearch.init({
   noResultsText: '<li class="no-results">Sorry, there are no results for that search.</li>',
   dataSource: '/search.json'
 })
+
+Holder.addTheme('gray', {
+  background: '#0275d8',
+  foreground: 'rgba(255,255,255,.65)',
+  font: 'Helvetica',
+  fontweight: 'normal',
+  size: 16,
+  text: 'Thumbnail'
+})
 </script>
 
 {% comment %}