{{ if not (.Site.Params.header.project_name) }}{{ errorf "Site.Params.header.project_name must be set in the site configuration file."}}{{ end }}
<div class="usa-overlay"></div>
<header class="usa-header usa-header--extended">
  <div class="usa-navbar">
    <div class="usa-logo" id="extended-logo">
      <em class="usa-logo__text"><a href="{{"/" | relURL }}" title="Home" aria-label="Home">{{ .Site.Params.header.project_name }}</a></em>
    </div>
    <button class="usa-menu-btn">Menu</button>
  </div>
  <na