View file htmly-2.9.8/themes/readable/404.html.php

<?php if (!defined('HTMLY')) die('HTMLy'); ?>
<?php if (!empty($breadcrumb)): ?>
    <div class="breadcrumb"><?php echo $breadcrumb ?></div>
<?php endif; ?>
<div class="post">
    <div class="main">
        <h1 class="title-post">This page doesn't exist!</h1>
        <p>Please search to find what you're looking for or visit our <a href="<?php echo site_url() ?>">homepage</a> instead.</p>
        <?php echo search() ?>
    </div>
</div>