app/views/layouts/letter_opener_web/letters.html.erb
<!DOCTYPE html>
<html>
<head>
<title>LetterOpenerWeb</title>
<%= render "layouts/letter_opener_web/styles" %>
<% if respond_to? :csp_meta_tag %>
<%= csp_meta_tag %>
<% end %>
<%= csrf_meta_tags %>
</head>
<body>
<%= yield %>
<%= render "layouts/letter_opener_web/javascripts" %>
</body>
</html>