add additionnalCss

site/snippets/header.php

@@ -30,6 +30,7 @@ $entryTopPos ??= 20;
   <meta name="robots" content="noindex, nofollow, noarchive">
 
   <?php if ($page->template() == 'linear' || $page->template() == 'grid'): ?>
+  <!-- SCHEMA -->
   <script type="application/ld+json">
     {
       "@context": "https://schema.org",
@@ -63,6 +64,14 @@ $entryTopPos ??= 20;
   <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
   <meta name="apple-mobile-web-app-title" content="actuel-inactuel" />
   <link rel="manifest" href="/site.webmanifest" />
+
+  <?php if ($page->additionnalCss()->isNotEmpty()): ?>
+    <!-- CUSTOM CSS -->
+    <style>
+      <?= $page->additionnalCss() ?>
+    </style>
+      
+  <?php endif ?>
 </head>
 
 <body