first

wp-content/themes/twentytwentyone/404.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ *
+ * @link https://codex.wordpress.org/Creating_an_Error_404_Page
+ *
+ * @package WordPress
+ * @subpackage Twenty_Twenty_One
+ * @since Twenty Twenty-One 1.0
+ */
+
+get_header();
+?>
+
+	<header class="page-header alignwide">
+		<h1 class="page-title"><?php esc_html_e( 'Nothing here', 'twentytwentyone' ); ?></h1>
+	</header><!-- .page-header -->
+
+	<div class="error-404 not-found default-max-width">
+		<div class="page-content">
+			<p><?php esc_html_e( 'It looks like nothing was found at this location. Maybe try a search?', 'twentytwentyone' ); ?></p>
+			<?php get_search_form(); ?>
+		</div><!-- .page-content -->
+	</div><!-- .error-404 -->
+
+<?php
+get_footer();