{%- if jekyll.environment == 'production' and site.google_analytics -%} <script

async
src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics }}"

></script> <script>

window.dataLayer = window.dataLayer || [];
function gtag() {
        dataLayer.push(arguments);
}
gtag('js', new Date());
gtag('config', '{{ site.google_analytics }}');

</script> {%- endif -%}