app/views/header/google/analytics.scala.html

<script async src="https://www.googletagmanager.com/gtag/js?id=UA-77941335-1"></script>
<script>
 window.dataLayer = window.dataLayer || [];
 function gtag(){dataLayer.push(arguments);}
 gtag('js', new Date());
 gtag('config', 'UA-77941335-1');
</script>