diff --git a/_includes/head.html b/_includes/head.html
index 6120c079e..0d9de904a 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -11,10 +11,21 @@
rel="stylesheet"
type="text/css"
/>
+
+{% if page.prism_css %}
+
+
+{% else %}
+
+{% endif %}