fix 404 page

layouts/404.html

@@ -2,7 +2,10 @@
 {{ define "main" }} {{ $featured_image := .Param "featured_image"}}
 {{ $featured_image := (trim $featured_image "/") | absURL }}
 <article>
-  <h1>
+  <h1 style="font-size:6rem;text-align:center">
+    404
+  </h1>
+  <h1 style="text-align:center">
     This is not the page you were looking for
   </h1>
 </article>