sophie-lewis-hugo/themes/sophie-lewis/layouts/_default/single.html

{{ define "main" }}
  {{ $content_class := $.Page.Params.title | lower }}
  {{ if eq (.Title | lower) "about" }}
      <div class="column is-one-third">
        <div class="headshot">
        {{ $img := relURL "img/headshot_example.png" }}
            {{ if isset $.Site.Params.about "headshot" }}
            {{ if fileExists ( printf "static/img/%s" $.Site.Params.about.headshot ) }}
              {{ $img := relURL ( printf "img/%s" $.Site.Params.about.headshot )}}
              <img src='{{ $img }}'>
            {{ else }}
              <img src='{{ $img }}'>
            {{ end }}
          {{ else }}
            <img src='{{ $img }}'>
          {{ end }}
        </div>
      </div>
    <div id="content" class='section {{ $content_class }}'>
      {{.Content}}
    </div>
  {{ else }}
    <div id="content" class='section {{ $content_class }}'>
      {{.Content}}
    </div>
  {{ end }}
{{ end }}