briansteeleca

add_filter('wp_grid_builder_map/marker_content', 
  function( $content, $marker ) {
    ob_start();
    $url = wp_get_attachment_url( get_post_thumbnail_id() );
    $excerpt = get_the_excerpt();
    if ( $url ) {
      echo '<div class="wpgb-map-marker-img">';
      echo '<div style="background-image:url(' . esc_url( $url ) . ');"></div>';
      echo '</div>';
    }