update portfolio sections

iamkonstantin_web/templates/includes/header.html

@@ -3,7 +3,7 @@
     <a href="#main" class="skip-link">Skip to content</a>
 
     {% get_site_root as site_root %}
-    <nav class="w-full flex justify-center my-8">
+    <nav class="w-full flex justify-center my-8 main">
         <ul class="flex space-x-8">
             <li><a href="{% pageurl site_root %}">{{ site_root.title }}</a></li>
             {% for menuitem in site_root.get_children.live.in_menu %}