Init

theme/404.php

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+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ *
+ * @link https://codex.wordpress.org/Creating_an_Error_404_Page
+ *
+ * @package studio-up
+ */
+
+get_header();
+?>
+
+	<section id="primary">
+		<main id="main">
+
+			<div>
+				<header class="page-header">
+					<h1 class="page-title"><?php esc_html_e( 'Page Not Found', 'studio-up' ); ?></h1>
+				</header><!-- .page-header -->
+
+				<div <?php studio_up_content_class( 'page-content' ); ?>>
+					<p><?php esc_html_e( 'This page could not be found. It might have been removed or renamed, or it may never have existed.', 'studio-up' ); ?></p>
+					<?php get_search_form(); ?>
+				</div><!-- .page-content -->
+			</div>
+
+		</main><!-- #main -->
+	</section><!-- #primary -->
+
+<?php
+get_footer();