Bulma CSS class .is-half-mobile

    <div class="columns">
        <div class="column is-half-mobile has-background-primary has-text-white">is-half</div>
        <div class="column has-background-info-dark has-text-white">Auto</div>
        <div class="column has-background-link-dark has-text-white">Auto</div>
    </div>