diff --git a/_includes/head.html b/_includes/head.html
index 94ee6f6..1e24f04 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -26,7 +26,7 @@
   <!-- RSS -->
   <link rel="alternate" type="application/rss+xml" title="RSS" href="/atom.xml">
   <style>
-    center {
+  .center {
       text-align: center;
       display: block;
       margin-left: auto;