layout.html.twig

{#
/**
 * @file
 * Template for a generic layout.
 */
#}
{% set classes = [
  'layout--' ~ layout.id|clean_class,
] %}
{% if content %}
<div{{ attributes.addClass(classes) }}>
{% for region in layout.getRegionNames %}
  <div class="{{ 'region--' ~ region|clean_class }}">
    {{ content[region] }}
  </div>
{% endfor %}
</div>
{% endif %}