{% if page.color %}

{% assign background = page.color %}

{% elsif page.tags %}

{% for tag in page.tags %}
  {% assign post_tag_downcase = tag | downcase %}
  {% for blog_tag in site.blog_tags %}
    {% assign blog_tag_title = blog_tag.title | downcase %}
    {% if blog_tag_title == post_tag_downcase %}
      {% assign background = blog_tag.color %}
    {% endif %}
  {% endfor %}
{% endfor %}

{% endif %}

<header class=“{% if page.title == 'Home' %}header__homepage{% endif %} bg–{{ background | default: 'green' }}”>

<nav>
  {% unless page.title == 'Home' %}
    <a class="header__home" href="{{ "/" | relative_url}}">{{ site.title | escape }}</a>
  {% endunless %}
  <ul>
    <li>
      <a class="header__link" href="/blog">Blog</a>
    </li>
    <li>
      <a class="header__link" href="/about">About</a>
    </li>
    <li>
      <a class="header__link" href="/contact">Contact</a>
    </li>
  </ul>
</nav>
{% unless page.title == 'Home' %}
  <h1 class="header__title">{{ page.title }}</h1>
{% endunless %}

</header>