app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>Rmmts</title>
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
<%= csrf_meta_tags %>
</head>
<body>
<p class="notice"><%= notice %></p>
<p class="alert"><%= alert %></p>
<%= yield %>
</body>
</html>