Adding Row of WordPress Posts to Recent Activity Template

<?php
/**
* Filename: WPPostsWide.php
* Author: LPH
*/
class TRN_XenWord_Model_WPPostsWide extends XenForo_Model {
   public static function getHtml() {

      define( 'WP_USE_THEMES', false );
      define( 'DOCUMENT_ROOT', $_SERVER['DOCUMENT_ROOT'] );

      // Change the path to the correct location
      require( DOCUMENT_ROOT . '/wp-blog-header.php' );

      echo '<div class="titleBar"><h1>Latest Articles</h1></div>';

      $wp_args = array(
         'numberposts' => '5',
         'offset'      => 0,
         'post_type'   => 'post',
         'post_status' => 'publish'
      );

      $recentPosts = wp_get_recent_posts( $wp_args );

      echo '<div class="recentPosts-container">';

         foreach ( $recentPosts as $recentPost ) {

            $wpPostThumbnail = get_the_post_thumbnail( $recentPost['ID'], array( 100, 100) );

            if ( empty( $wpPostThumbnail ) ) {

               echo '<div class="recentPosts">';
               echo '<div class="recentPosts-title">';
               echo "<h4><a href='" . esc_url( get_permalink( $recentPost['ID'] ) ) . "'>" . $recentPost['post_title'] . '</a></h4>';
               echo '</div></div>';

            } else {

               echo '<div class="recentPosts"><div class="recentPosts-title">';
               echo '<div class="wide-thumbnail">' . $wpPostThumbnail . '</div>';
               echo "<h4><a href='" . esc_url( get_permalink( $recentPost['ID'] ) ) . "'>" . $recentPost['post_title'] . '</a></h4><br />';
               echo '</div></div>';
            }
         }

         wp_reset_query();

      echo '</div>';
   }
}

// End WPPosts.php

div.recentPosts-title {
    margin-top: 10px;
}

div.recentPosts-container {
    display: flex;
    overflow: hidden;
}

div.recentPosts {
    width: 20%;
    padding: 10px;
    text-align: center;
    border: 1px solid lightblue;
    margin: 10px;
    background-color: aliceblue;
}

div.wide-thumbnail {
    overflow: hidden;
}