natronics.org/_layouts/base.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="natronics.org">

    {% capture caching %}{% if jekyll.environment == "production" %}.{{ site.time | date: '%s' }}{% else %}{% endif %}{% endcapture %}
    <link rel="shortcut icon" href="/favicon{{ caching }}.ico">
    <link rel="stylesheet" href="/assets/style{{ caching }}.css">
    <title>{{ page.title }}</title>
  </head>
  <body>
    <header>
      <span class="title">natronics.org</span>
    </header>
    {{ content }}
    <footer>
      made in the vapid, generic boretown of Boulder, CO.
    </footer>
  </body>
</html>