bootstrap-9-3.html.twig in Bootstrap Layouts 8

<div class="row">
    {% if content.sidebar_right %}
    <div class="col-sm-9">
        {{ content.sidebar_right }}
    </div>
    {% endif %}
    {% if content.sidebar_left %}
    <div class="col-sm-3">
        {{ content.sidebar_left }}
    </div>
    {% endif %}
</div>