{%- if jekyll.environment == 'production' and site.google_tag_manager.tracking_id -%}

<!-- Google Tag Manager -->
<script>(function (w, d, s, l, i) {
    w[l] = w[l] || []; w[l].push({
      'gtm.start':
        new Date().getTime(), event: 'gtm.js'
    }); var f = d.getElementsByTagName(s)[0],
      j = d.createElement(s), dl = l != 'dataLayer' ? '&l=' + l : ''; j.async = true; j.src =
        'https://www.googletagmanager.com/gtm.js?id=' + i + dl; f.parentNode.insertBefore(j, f);
  })(window, document, 'script', 'dataLayer', '{{ site.google_tag_manager.tracking_id }}');</script>
<!-- End Google Tag Manager -->

{%- endif -%}