Clameurs/sites/all/themes/figureslibres/clameurs/preprocess/panels-clameur.pre.php

<?php

  // dsm($vars, 'vars');

  $display = $vars['display'];
  $node_ctx = $display->context['requiredcontext_entity:node_1'];
  // dsm($node_ctx, 'node_ctx');

  // change css id with node alias to be able to link it with anchors on top menu
  $vars['css_id'] = drupal_get_path_alias('node/'.$node_ctx->data->nid);
  // dsm($vars['css_id'], 'css_id');