    <article class="article" itemscope itemtype="http://schema.org/CreativeWork">

      <header class="post-header">
        <h1 class="post-title entry-title" itemprop="headline"><?php _e( 'Not Found', 'estelle' ); ?></h1>
      </header>

      <article class="post-content entry-content" itemprop="text">

        <p><?php _e( 'You have come to a page that is either not existing or already been removed', 'estelle' ); ?>.</p>

        <?php get_search_form();?>

        <section class="split-columns">
        <article class="left">
          <h3><?php _e( 'Archives by month:', 'estelle' ); ?></h3>
          <ul>
            <?php wp_get_archives( 'type=monthly' ); ?>
          </ul>
        </article>
        <article class="right">
          <h3><?php _e( 'Archives by category:', 'estelle' ); ?></h3>
          <ul>
            <?php wp_list_categories( 'sort_column=name' ); ?>
          </ul>
        </article>
        </section>

      </article><!-- .post-content -->

    </article><!-- .article -->