hugo-snap-gallery/layouts/partials/lightbox.html

{{- $imgs := .imgs -}}
{{- $galno := .galno -}}
<div class="snap-lightbox" id="snap-lightbox-{{ $galno }}">
  {{- range $i, $img := $imgs }}
  <div class="snap-lightbox-inner">
    <div class="snap-numbertext">{{ add $i 1 }} / {{ len $imgs }}</div>
    <img
      src="{{ relURL $img.src }}"
      {{ range $attr, $value := $img.html -}}
        {{ safeHTMLAttr $attr }}={{ $value }}
      {{ end -}}
    />
    {{- with $img.html.title }}
      <div class="snap-caption">{{ . }}</div>
    {{- end }}
  </div>
  {{- end -}}

  <!-- Close and Next/previous controls -->
  <span class="snap-close" onclick="closeLightbox({{ $galno }})">&times;</span>

  <a class="snap-prev" onclick="moveLightboxItem({{ $galno }}, -1)"><span>&#10094;</span></a>
  <a class="snap-next" onclick="moveLightboxItem({{ $galno }}, 1)"><span>&#10095;</span></a>
</div>