app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title><%= full_title(yield(:title)) %></title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
<%= render 'layouts/shim' %>
</head>
<body>
<%= render 'layouts/header' %>
<div class="container">
<% flash.each do |name, msg| %>
<div class="alert alert-<%= name.to_s == 'notice' ? "success" : "danger" %>" > <%= msg %> </div>
<% end %>
<%= yield %>
<%= render 'layouts/footer' %>
</div>
</body>
</html>