gcg-website/layouts/partials/collapsible.html

<div class="card border-primary rounded-2 hover-shadow mb-4">
  <div class="card-body mb-0">
    <details>
      <summary>{{ .title }}</summary>
      <div class="content text-justify">
        <div>{{ .content }}</div>
      </div>
    </details>
  </div>
</div>