src/layouts/default.njk

<!DOCTYPE {{ page.doctype or 'html' }}>
<html {% if page.htmlClass %}class="{{ page.htmlClass }}"{% endif %} lang="{{ page.language or 'en' }}" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
<head>
  <meta charset="{{ page.charset or 'utf-8' }}">
  <meta name="x-apple-disable-message-reformatting">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="format-detection" content="telephone=no, date=no, address=no, email=no">
  {% if page.title %}<title>{{ page.title }}</title>{% endif %}
  {% if page.googleFonts %}<link href="https://fonts.googleapis.com/css?family={{ page.googleFonts }}" rel="stylesheet" media="screen">{%- endif %}
  <!--[if mso]>
  <xml>
    <o:OfficeDocumentSettings>
      <o:PixelsPerInch>96</o:PixelsPerInch>
    </o:OfficeDocumentSettings>
  </xml>
  <style>
    table {border-collapse: collapse;}
    td,th,div,p,a,h1,h2,h3,h4,h5,h6 {font-family: "Segoe UI", sans-serif; mso-line-height-rule: exactly;}
  </style>
  <![endif]-->
  {% if css %}<style>{{ css }}</style>{% endif %}
  {% block head %}{% endblock %}
</head>
<body {% if page.bodyClass %}class="{{ page.bodyClass }}"{% endif %}>
  {% if page.preheader %}
    <div class="hidden">{{ page.preheader }}</div>
  {% endif %}

  <div role="article" aria-roledescription="email" aria-label="{{ page.title or '' }}" lang="{{ page.language or 'en'}}">
    {% block template %}{% endblock %}
  </div>
</body>
</html>