cupper-hugo-theme/layouts/partials/header.html

<header class="intro-and-nav" role="banner">
  <div>
    <div class="intro">
      <a
        class="logo"
        href="{{ .Site.BaseURL }}"
        aria-label="{{ .Site.Title }} home page"
      >
        <img src="{{ "images/logo.svg" | relURL }}" alt="">
      </a>
      <p class="library-desc">
        {{ with .Site.Params.description }} {{ . | markdownify }} {{ end }}
      </p>
    </div>
    {{ partial "nav.html" . }}
  </div>
</header>