railties/lib/rails/generators/rails/plugin/templates/app/views/layouts/%namespaced_name%/application.html.erb.tt
<!DOCTYPE html>
<html>
<head>
<title><%= humanized %></title>
<%%= csrf_meta_tags %>
<%%= csp_meta_tag %>
<%%= stylesheet_link_tag "<%= namespaced_name %>/application", media: "all" %>
</head>
<body>
<%%= yield %>
</body>
</html>