zdoc/layouts/shortcodes/expand.html

<div class="expand">
  <button type="button" class="expand__button" aria-label="Expand Button">
    <span class="expand-icon expand-icon__right">
        {{ partial "svgs/arrow-right.svg" (dict "width" 24 "height" 24) }}
    </span>
    {{.Get 0}}
  </button>
  <div class="expand__content">
    {{.Inner | markdownify}}
  </div>
</div>