adaptivetheme-8.x-3.x-dev/at_core/templates/layout/region.html.twig

{#
/**
 * @file
 * Theme override to display a region.
 *
 * Available variables:
 * - content: The content for this region, typically blocks.
 * - attributes: HTML attributes for the region <div>.
 * - region: The name of the region variable as defined in the theme's
 *   .info.yml file.
 *
 * @see template_preprocess_region()
 */
#}
{%-
  set classes = [
    'l-r',
    'region',
    region_row ? 'pr-' ~ region_row|clean_class ~ '__' ~ region|clean_class : region|clean_class
  ]
-%}
{%- if content -%}
  <div {{ attributes.addClass(classes) }} id="rid-{{ region|clean_id }}">{{- content -}}</div>
{%- endif -%}