postcss-cli-defer/layouts/_default/baseof.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>
      {{ .Title }}
    </title>
    <meta name="description" content="{{ .Description }}" />
    {{ with (templates.Defer (dict "key" "global")) }}
      {{ $t := debug.Timer "postcss" }}
      {{ with resources.Get "css/styles.css" }}
        {{ $opts := dict
          "inlineImports" true
        }}
        {{ with . | css.PostCSS $opts }}
          {{ if hugo.IsDevelopment }}
            <link rel="stylesheet" href="{{ .RelPermalink }}" />
          {{ else }}
            {{ with . | minify | fingerprint }}
              <link
                rel="stylesheet"
                href="{{ .RelPermalink }}"
                integrity="{{ .Data.Integrity }}"
                crossorigin="anonymous" />
            {{ end }}
          {{ end }}
        {{ end }}
      {{ end }}
      {{ $t.Stop }}
    {{ end }}
  </head>
  <body class="my-10">
    {{ block "main" . }}{{ end }}
  </body>
</html>