hugo-theme-next/layouts/partials/menus.html

<ul class="main-menu menu">
  {{- $curP := . }}
  {{- range .Site.Menus.main }}
  {{ $active := or ($curP.IsMenuCurrent "main" .) ($curP.HasMenuCurrent "main" .) }}
  {{ $active = or $active (eq .URL "/")}}
  <li class="menu-item menu-item-{{ .Identifier }}">
    <a href="{{ .URL }}" class="hvr-icon-pulse{{if $active }} menu-item-active{{ end }}" rel="section">
      <i class="fa fa-{{ .Pre }} hvr-icon"></i>{{- .Name }}
    </a>
  </li>
  {{- end }}
</ul>