Morden: update 404 page markup to fix layout

morden/404.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ *
+ * @link https://codex.wordpress.org/Creating_an_Error_404_Page
+ *
+ * @package WordPress
+ * @subpackage Varia
+ * @since 1.0.0
+ */
+
+get_header();
+?>
+
+	<section id="primary" class="content-area">
+		<main id="main" class="site-main">
+
+			<div class="error-404 not-found">
+				<header class="page-header">
+					<h1 class="page-title"><?php _e( 'Oops! That page can&rsquo;t be found.', 'varia' ); ?></h1>
+				</header><!-- .page-header -->
+
+				<div class="page-content responsive-max-width">
+					<p><?php _e( 'It looks like nothing was found at this location. Maybe try a search?', 'varia' ); ?></p>
+					<?php get_search_form(); ?>
+				</div><!-- .page-content -->
+			</div><!-- .error-404 -->
+
+		</main><!-- #main -->
+	</section><!-- #primary -->
+
+<?php
+get_footer();