layouts/_default/baseof.html

<html>
  <head>
    
    
{{ if .Site.IsServer }}

  {{ $style := resources.Get "css/styles.css" | postCSS (dict "config" "./assets/css/dev/postcss.config.js") | fingerprint }}
    
  <link rel="stylesheet" href="{{ $style.Permalink }}" data> 

{{ else }}

  {{ $style := resources.Get "css/styles.css" | postCSS (dict "config" "./assets/css/postcss.config.js")  | minify | fingerprint }}
  
  <link rel="stylesheet" href="{{ $style.Permalink }}" integrity="{{ $style.Data.Integrity }}"> 

{{ end }}

    
  </head>
  <body>
    {{ block "main" . }}{{ end }}
  </body>
</html>