{{ if .Section }}
<nav class="post-nav">
  <span class="nav-prev">{{ with .NextInSection }}<a href="{{ .RelPermalink }}">&larr; {{ .Title }}</a>{{ end }}</span>
  <span class="nav-next">{{ with .PrevInSection }}<a href="{{ .RelPermalink }}">{{ .Title }} &rarr;</a>{{ end }}</span>
</nav>
{{ end }}