themes-wordpress/shoreditch/404.php

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

get_header(); ?>

	<div class="site-content-wrapper">

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

				<section class="error-404 not-found">
					<header class="page-header">
						<h1 class="page-title"><?php esc_html_e( 'Oops! That page can&rsquo;t be found.', 'shoreditch' ); ?></h1>
					</header><!-- .page-header -->

					<div class="page-content">
						<p><?php esc_html_e( 'It looks like nothing was found at this location. Maybe try one of the links below or a search?', 'shoreditch' ); ?></p>

						<?php
						get_search_form();

						the_widget( 'WP_Widget_Recent_Posts' );

						// Only show the widget if site has multiple categories.
						if ( shoreditch_categorized_blog() ) :
						?>

						<div class="widget widget_categories">
							<h2 class="widget-title"><?php esc_html_e( 'Most Used Categories', 'shoreditch' ); ?></h2>
							<ul>
							<?php
							wp_list_categories( array(
								'orderby'    => 'count',
								'order'      => 'DESC',
								'show_count' => 1,
								'title_li'   => '',
								'number'     => 10,
							) );
							?>
							</ul>
						</div><!-- .widget -->

						<?php
						endif;

						/* translators: %1$s: smiley */
						$archive_content = '<p>' . sprintf( esc_html__( 'Try looking in the monthly archives. %1$s', 'shoreditch' ), convert_smilies( ':)' ) ) . '</p>';
						the_widget( 'WP_Widget_Archives', 'dropdown=1', "after_title=</h2>$archive_content" );

						the_widget( 'WP_Widget_Tag_Cloud' );
						?>

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

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

	<?php get_sidebar(); ?>

	</div><!-- .site-content-wrapper -->

<?php
get_sidebar( 'footer' );
get_footer();