wordpress 404.php

<?php
/**
 * The template for displaying 404 pages (not found)
 *
 * @package WordPress
 * @subpackage Twenty_Twenty_One
 * @since Twenty Twenty-One 1.0
 */

get_header();
?>

<main id="site-content" role="main">

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

        <div class="entry-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(); ?>

            <?php the_widget( 'WP_Widget_Recent_Posts' ); ?>

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

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

            <?php the_widget( 'WP_Widget_Tag_Cloud' ); ?>

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

</main><!-- #site-content -->

<?php get_footer(); ?>