app/views/layouts/active_admin_logged_out.html.erb
<!doctype html>
<html lang="<%= I18n.locale %>">
<head>
<title><%= html_head_site_title %></title>
<%= render "active_admin/html_head" %>
</head>
<body class="bg-gray-50 dark:bg-gray-900 text-gray-950 dark:text-gray-100 antialiased">
<div class="flex flex-col items-center justify-center min-h-screen py-4 sm:px-6 sm:py-8 mx-auto">
<%= render "active_admin/flash_messages" %>
<%= yield %>
</div>
</body>
</html>