Bootstrap CSS class .col-sm-1

    <div class="container">
        <div class="row bg-secondary">
            <div class="col-3 col-sm-1 bg-warning p-3">
                col-sm-1
            </div>
            <div class="col-3 bg-primary p-3">
                col-3
            </div>
            <div class="col-3 bg-info p-3">
                col-3
            </div>
        </div>
    </div>