app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, minimal-ui" />
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
<title>money</title>
</head>
<div class="container">
<div id="money">
<%= yield %>
</div>
</div>
</html>