Hubspot - Multiple columns in blog listing

gistfile1.txt

{% set items = contents|length %}
{# Change '3' with the number of columns you'd like to display #}
{% set itemsPerColumn = items|divide(3) %}

{% for row in contents|batch(itemsPerColumn, ' ') %}
    <div class="column span{{ itemsPerColumn }}">
        {% for content in row %}
            <div class="post-item">
              ....
            </div>
        {% endfor %}
    </div>
{% endfor %}