vanilla-hugo/layouts/shortcodes/sidenote.html

<span class="sidenote">
<label class="sidenote-label" for="{{ .Get 1 }}">{{ .Get 2 }}</label>
<input class="sidenote-checkbox" type="checkbox" id="{{ .Get 1 }}"></input>
{{ if $offset := .Get 3 }}
<span class="sidenote-content sidenote-{{ .Get 0 }}" style="margin-top: {{ $offset }}rem">
{{ else }}
<span class="sidenote-content sidenote-{{ .Get 0 }}">
{{ end }}
<span class="sidenote-delimiter">[{{ i18n "note" }}:</span>
{{ .Inner }}
<span class="sidenote-delimiter">]</span>
</span>
</span>