hugo/docs/layouts/showcase/thumbnail.html

<div class="col-sm-6 col-md-4" style="padding-bottom:1em;">
    <div class="thumbnail">
    <a href="{{ .Params.sitelink }}"><img class="img-responsive img-rounded" style="width:100%;" src="{{ .Params.thumbnail }}" alt="{{ .Description }}"></a>
    <h4>
      <a href="{{ .Params.sitelink }}">{{ .Title }}</a>
      {{ if (isset .Params "sourcelink") }} 
      <a href="{{ .Params.sourcelink }}" class="small pull-right">source</a>
      {{ end }}
    </h4>
            {{ range .Params.tags }}
            <span class="label label-default" style="font-size:60%;">{{ . }}</span>
            {{ end }}
    </div>
</div>