wordpress/php-fpm/wordpress_files/themes/simple-catch/404.php

<?php
/**
 * The template for displaying 404 pages (Not Found).
 *
 * @package Catch Themes
 * @subpackage Simple_Catch_Pro
 * @since Simple Catch 1.0
 */
get_header(); ?>
        <section class="error-404 not-found">
            <header class="entry-header">
                <h1 class="entry-title"><?php _e( 'Error 404 - Page Not Found.', 'simple-catch' ); ?></h1>
            </header><!-- .page-header -->
            <div class="page-content entry-content clearfix">
                <p><?php _e( 'We&rsquo;re sorry! This page is not available.', 'simple-catch' ); ?></p>
                <h4><?php _e( 'This might be because:', 'simple-catch' ); ?></h4>
                <p><?php _e( 'You have typed the web address incorrectly, or the page you were looking for may have been moved, updated or deleted.', 'simple-catch' ); ?></p>
                <h4><?php _e( 'Please try the following options instead:', 'simple-catch' ); ?></h4>
                <p><?php _e( 'Check for a mis-typed URL error, then press the refresh button on your browser or Use the search box below.', 'simple-catch' ); ?></p>
                <?php
                // get search form
                get_search_form();
                ?>
          	</div>
    	</section>

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

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

<?php
/**
 * simplecatch_below_primary hook
 */
do_action( 'simplecatch_below_primary' );
?>

<?php get_footer(); ?>