hugo-theme-terminal/layouts/404.html

{{ define "main" }}
<div class="post">
  <h1 class="post-title">404!</h1>

  <div class="post-content">
    {{ .Site.Params.missingContentMessage }}<br>
    <a href="{{ "/" | absURL }}">{{ .Site.Params.missingBackButtonLabel }}&nbsp;→</a>
  </div>

</div>
{{ end }}