lens/v4.0.2/custom_theme/main.html

{% extends "base.html" %}

{% block analytics %}
  <!-- Global site tag (gtag.js) - Google Analytics -->
  <script async src="https://www.googletagmanager.com/gtag/js?id=G-90E1JB4HW4"></script>
  <script>
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', 'G-90E1JB4HW4');
  </script>
{% endblock %}