at_theme-1.4.1/at_core/layout_plugin/templates/twocol/at-layout--twocol.html.twig

{#
/**
 * @file
 * Adaptivetheme implementation to display a two column Layout Plugin layout.
 *
 * Available variables:
 * - content: holds layout regions.
 * - attributes: layout attributes.
#}
{%- set int = [] -%}
{%- for region in ['col_1', 'col_2'] %}
  {%- if content["#{region}"]|render|trim is not empty -%}
    {%- set int = int|merge([region|slice(4, 1)]) -%}
  {%- endif -%}
{%- endfor -%}
{%- set layout_classes = ['l-arc--' ~ int|length, 'l-ac--' ~ int|join('-')] -%}
{%- set element = html_element|default('div') -%}
<{{- element }}{{ attributes.addClass(layout_classes) -}}>
  {% if content.top|render|trim is not empty %}
    <div class="atl__lr">
      <div class="atl__lc atl__top">
        {{ content.top }}
      </div>
    </div>
  {% endif %}

  {% if content.col_1 or content.col_2 %}
    <div class="atl__lr atl__cw">
      {% if content.col_1|render|trim is not empty %}
        <div class="atl__lc lc-1">
          {{ content.col_1 }}
        </div>
      {% endif %}

      {% if content.col_2|render|trim is not empty %}
        <div class="atl__lc lc-2">
          {{ content.col_2 }}
        </div>
      {% endif %}
    </div>
  {% endif %}

  {% if content.bottom|render|trim is not empty %}
    <div class="atl__lr">
      <div class="atl__lc atl__bottom">
        {{ content.bottom }}
      </div>
    </div>
  {% endif %}
</{{- element -}}>