Morden: Update classes on 404 template.

morden/template-parts/content/content-none.php

@@ -16,7 +16,7 @@
 		<h1 class="page-title"><?php _e( 'Nothing Found', 'varia' ); ?></h1>
 	</header><!-- .page-header -->
 
-	<div class="page-content">
+	<div class="page-content responsive-max-width">
 		<?php
 		if ( is_home() && current_user_can( 'publish_posts' ) ) :