cherrykitten.dev/templates/shortcodes/gallery.html

<div class="gallery">
  {% for asset in page.assets -%} {%- if asset is matching("[.](jpg|png)$") -%}
  {% set image = resize_image(path=asset, width=960, height=720, op="fit") %}
    <a href="{{ get_url(path=asset) }}" target="_blank">
      <img src="{{ image.url }}" />
    </a>
  </label>
  {%- endif %} {%- endfor %}
</div>