app/views/shared/_rails_defaults.html.erb
<%= csrf_meta_tags %>
<%= csp_meta_tag %>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" integrity="sha256-NuCn4IvuZXdBaFKJOAcsU2Q3ZpwbdFisd5dux4jkQ5w=" crossorigin="anonymous" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.8.2/css/all.min.css" integrity="sha256-BtbhCIbtfeVWGsqxk1vOHEYXS6qcvQvLMZqjtpWUEx8=" crossorigin="anonymous" />
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
<script src="app/public/js/jquery.cookie.js"></script>