native-404page-theme-sample.php

<div class="container">

  <div id="primary">

    <div id="content">

      <?php 

        $pp404 = false;

        // instead of is_404() you'll probably use another code to identify a 404 error
        // if PP_404 is defined the 404page plugin is active
        // if pp_404_is_active() returns true a custom 404 page is selected and exists ?>
    
        if ( is_404() && defined( 'PP_404' ) && pp_404_is_active() ) { 

          pp_404_set_native_support(); 
          $pp404 = true; 

        } 

      ?>

      <?php // using a do while loop ensures that the loop is exuted at least once even if there are no posts ?>
			
      <?php do { ?>

        <?php if ( !$pp404 ) { the_post(); } ?>

        <article class="post">

          <h1 class="title"><?php if ( $pp404 ) { pp_404_the_title(); } else { the_title(); } ?></h1>

          <div class="the-content">

            <?php if ( $pp404 ) { pp_404_the_content(); } else { the_content(); } ?>

            <?php if ( ! $pp404 ) { wp_link_pages(); } ?>

          </div>

        <article>

      <?php } while ( have_posts() ); ?>

    </div>
    
  </div>

</div>