{% match theme %}
{% when Some with (Theme::Dark) %}
{% when Some with (Theme::Light) %}
{% when Some with (Theme::System) %}
{% when None %}
{% endmatch %}
{% block head %}{% endblock %}
{% block body %}
{% block title %}{% endblock %}
{% block nav_actions %}{% endblock %}
{% match theme %}
{% when None %}
{% when Some with (Theme::System) %}
{% when Some with (Theme::Dark) %}
{% when Some with (Theme::Light) %}
{% endmatch %}