hugo-theme-bootstrap4-blog/layouts/partials/header.html

<div class="blog-header">
  <div class="container">
    <h1 class="blog-title">{{ .Title | safeHTML }}</h1>
    {{ if .Site.Params.description }}<p class="lead blog-description">{{ .Site.Params.description | safeHTML }}</p>{{ end }}
  </div>
</div>