app/template/default/Block/gtm_body.twig line 1

Open in your IDE?
  1. <!-- Google Tag Manager (noscript) -->
  2. <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-N6LW5D4Q"
  3. height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
  4. <!-- End Google Tag Manager (noscript) -->