bootstrap-6-6-stacked.html.twig in Bootstrap Layouts 8

<div class="row">
    {% if content.top %}
        <div class="col-sm-12">
            {{ content.top }}
        </div>
    {% endif %}

    {% if content.sidebar_left %}
        <div class="col-sm-6">
            {{ content.sidebar_left }}
        </div>
    {% endif %}

    {% if content.sidebar_right %}
        <div class="col-sm-6">
            {{ content.sidebar_right }}
        </div>
    {% endif %}

    {% if content.bottom %}
    <div class="col-sm-12">
        {{ content.bottom }}
    </div>
    {% endif %}
</div>