{%
  set classes = [
    'layout',
    'layout--one-column',
  ]
%}
{% if content %}
  <section{{ attributes.addClass(classes) }}>
    {{ content.custom.header }}

    <div class="layout__regions">
      <div {{ region_attributes.content }} class="layout__region layout__region--content">
        {{ content.content }}
      </div>
    </div>
  </section>
{% endif %}
