404.php

<?php
/**
 * The template for displaying 404 pages (not found).
 *
 * @link https://codex.wordpress.org/Creating_an_Error_404_Page
 *
 * @package _s
 */

get_header(); ?>

	<div class="primary content-area">
		<main id="main" class="site-main">

			<section class="error-404 not-found">
				<header class="page-header">
					<h1 class="page-title"><?php esc_html_e( 'Sorry, this page doesn\'t exist.', '_s' ); ?></h1>
				</header><!-- .page-header -->

				<div class="page-content">

					<p><?php esc_html_e( 'It seems we can’t find what you’re looking for. Perhaps searching can help.', '_s' ); ?></p>

					<?php get_search_form(); ?>

				</div><!-- .page-content -->
			</section><!-- .error-404 -->

		</main><!-- #main -->
	</div><!-- .primary -->

<?php get_footer(); ?>