app/views/layouts/csv_import_magic.html.erb
<!DOCTYPE html>
<html lang="pt">
<head>
<meta charset="utf-8">
<title>Title</title>
<link href="/favicon.ico" rel="shortcut icon">
<%= stylesheet_link_tag "application", :media => "all" %>
<%= csrf_meta_tags %>
</head>
<body class="csv_import_magic">
<%- if flash %>
<% flash.each do |key, value| %>
<div class="flash-message <%= key %>"><%= value %></div>
<% end %>
<% end %>
<div class="wrapper">
<main>
<div class="container">
<%= yield %>
</div>
</main>
</div>
<%= javascript_include_tag "application" %>
<%= yield :javascript %>
</body>
</html>