echo/website/layouts/partials/sidenav.html

<nav class="w3-sidenav w3-border-right">
  <button class="w3-btn w3-white w3-border w3-border-theme w3-round-xlarge" onclick="location.href='/support-echo';">
    <i class="fa fa-heart" aria-hidden="true"></i> Support Echo
  </button>
  {{ $currentNode := . }}
  <div class="menu">
    {{ range .Site.Menus.main }}
      <a{{ if or ($currentNode.HasMenuCurrent "main" .) ($currentNode.IsMenuCurrent "main" .) }} class="active"{{ end }} href="{{ .URL }}">
        {{ .Name }}
      </a>
    {{ end }}
  </div>
  <div class="sub-menu">
    {{ if .IsPage }}
      {{ range where .Site.Menus.main "Identifier" .Type }}
        <h3>{{ .Pre }} {{ .Name }}</h3>
        {{ range .Children }}
          <a{{ if $currentNode.IsMenuCurrent "main" . }} class="active"{{ end }} href="{{ .URL }}">
            {{ .Name }}
          </a>
        {{ end }}
      {{ end }}
    {{ end }}
  </div>
</nav>