Bulma class: .is-0-tablet

    <div class="columns is-variable is-0-tablet">
        <div class="column">
            <div class="has-background-link-dark has-text-white has-text-centered">1</div>
        </div>
        <div class="column">
            <div class="has-background-info-dark has-text-white has-text-centered">2</div>
        </div>
        <div class="column">
            <div class="has-background-link-dark has-text-white has-text-centered">3</div>
        </div>
        <div class="column">
            <div class="has-background-info-dark has-text-white has-text-centered">4</div>
        </div>
        <div class="column">
            <div class="has-background-link-dark has-text-white has-text-centered">5</div>
        </div>
        <div class="column">
            <div class="has-background-info-dark has-text-white has-text-centered">6</div>
        </div>
    </div>