Bootstrap CSS class .col-1

    <div class="container">
        <div class="row">
            <div class="col-1 bg-primary p-3">
                col-1
            </div>
            <div class="col-2 bg-warning p-3">
                col-2
            </div>
            <div class="col-9 bg-info p-3">
                col-9
            </div>
        </div>
    </div>