app/views/layouts/no_headers.html.erb
<!DOCTYPE html>
<html>
<head>
<title><%= app_title %></title>
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
<%= csrf_meta_tags %>
<meta name="theme-color" content="<%= app_colour %>" />
<meta name="msapplication-navbutton-color" content="<%= app_colour %>" />
<meta name="apple-mobile-web-app-status-bar-style" content="<%= app_colour %>" />
<meta name="viewport" content="width=device-width, shrink-to-fit=no, initial-scale=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
<% if Config.google_client_id.present? %>
<meta name="google-signin-client_id" content="<%= Config.google_client_id %>.apps.googleusercontent.com">
<% end%>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.9.0/css/bulma.css">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<script src="//cdn.jsdelivr.net/npm/fingerprintjs2@2.1.0/dist/fingerprint2.min.js"></script>
</head>
<body>
<%= yield %>
</body>
</html>