kcl-digital-humanities-garden/_includes/header.html

<header id="header" class="f5 pa3 flex bb b--dark-green bg-washed-green justify-between sticky top-0 w-100 items-baseline">
  {%- assign default_paths = site.pages | map: "path" -%}
  {%- assign page_paths = site.header_pages | default: default_paths -%}
  {%- assign titles_size = site.pages | map: 'title' | join: '' | size -%}
  <a class="no-underline f4 dark-green anthony" rel="author" href="{{ "/" | relative_url }}">{{ site.title | escape }}</a>

  {%- if titles_size > 0 -%}
    <nav>
      {%- for path in page_paths -%}
        {%- assign my_page = site.pages | where: "path", path | first -%}
        {%- if my_page.title -%}
          <a class="f7 no-underline dark-green" href="{{ my_page.url | relative_url }}">{{ my_page.title | escape }}</a>
        {%- endif -%}
      {%- endfor -%}
    </nav>
  {%- endif -%}
</header>