erynwells.me/layouts/_default/index.html

{{ define "main" }}
<h1>{{ .Title }}</h1>
{{ .Content }}
{{ with site.Menus.main }}
{{ $url := $.RelPermalink }}
<nav>
  {{ range . }}
  <li><a class="{{ if eq .URL $url }}active{{ end }}" href="{{ .URL }}"><span>{{ .Name }}</span></a></li>
  {{ end }}
</nav>
{{ end }}
{{ end }}