sass-site/source/_includes/header.liquid

<header
  class="sl-r-banner"
  itemtype="http://schema.org/WPHeader"
  itemscope="itemscope"
  role="banner">
  {% for alert in alerts | default: [] %}
    <div class="sl-c-alert sl-c-alert--special">
      <div class="sl-l-container">
        <h2 class="sl-c-alert-title">{{ alert.heading | typogr }}</h2>
        {{ alert.body | markdown }}
      </div>
    </div>
  {% endfor %}

  <div class="sl-c-pop-stripe"></div>
  <div class="sl-l-container">
    <div class="sl-l-grid sl-l-grid--full sl-l-large-grid--fit sl-l-large-grid--center sl-l-large-grid--gutters">
      <p class="sl-l-grid__column sl-r-banner__brand">
        <a href="/"><img height="48" alt="Sass" src="/assets/img/logos/logo.svg"></a>
      </p>

      {% renderFile 'source/_includes/header_nav.md' %}
    </div>
  </div>
</header>