set $banner_head '        <link rel="stylesheet" type="text/css"  href="/Chapril-banner/v1/chapril-banner.css" />';
set $banner_body '    <!-- CHAPRIL BANNER -->
    <header id="chapril-banner">
      <div id="chapril-banner-zone">
    <div id="chapril-banner-logo">
      <a href="https://www.chapril.org/"><img src="/Chapril-banner/v1/chapril-logo-small.png" alt="Logo Chapril" /></a>
    </div>
    <div id="chapril-banner-menu">
      <ul>
        <li><a href="https://www.chapril.org/">Accueil Chapril</a></li>
        <li><a href="https://www.chapril.org/services.html">Services libres</a></li>
        <li><a href="https://pouet.april.org/@aprilorg">Nous suivre</a></li>
        <li><a href="https://www.chapril.org/cgu.html">CGU</a></li>
        <li><a href="https://www.chapril.org/a-propos.html">Mentions légales</a></li>
        <li><a href="https://www.chapril.org/contact.html">Nous contacter</a></li>
      </ul>
    </div>
    <div id="chapril-banner-aprillogo">
      <a href="https://www.april.org/"><img src="/Chapril-banner/v1/april-logo-small.png" alt="Logo April" /></a>
    </div>
      </div>
    </header>';

subs_filter '</head>' '
$banner_head
</head>';
subs_filter '</body>' '
$banner_body
  </body>';

sub_filter_once on;