tag. */ use Drupal\node\Entity\Node; /** * Implements hook_preprocess_html(). */ function body_node_id_class_preprocess_html(&$variables) { // Add node id to the body class. $node = \Drupal::routeMatch()->getParameter('node'); if ($node instanceof Node) { $variables['attributes']['class'][] = 'page-node-' . $node->id(); $variables['attributes']['class'][] = 'page-node-type-' . $node->bundle(); } else { $variables['attributes']['class'][] = 'page-node-' . $node; } }