404 pages use <main>

404.html

@@ -4,7 +4,7 @@
 paginated: false
 ---
 
-<section class="error-page grid-container">
+<main class="error-page grid-container">
   <div class="grid-y">
     <div class="cell large-8 large-offset-2 medium-10 medium-offset-1">
       <h1 class="text-left">Sorry you've not found what you're looking for.</h1>
@@ -13,4 +13,4 @@ <h1 class="text-left">Sorry you've not found what you're looking for.</h1>
       <p>Head back to our <a href="http://www.scottlogic.com/">Homepage</a> or <a href="http://blog.scottlogic.com/">Blog</a> and you'll find simple paths to all our most interesting content.</p>
     </div>
   </div>
-</section>
+</main>