Template source: bootstrap4/inputs.html

{% if inputs %}
    <div class="form-group">
        {% if label_class %}
            <div class="aab {{ label_class }}"></div>
        {% endif %}

        <div class="{{ field_class }}">
            {% for input in inputs %}
                {% include "bootstrap4/layout/baseinput.html" %}
            {% endfor %}
        </div>
    </div>
{% endif %}