lib/assets/partials/_head.html.erb
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<link href="<%= resource_prefix %>assets/css/bootstrap.min.css" rel="stylesheet">
<link href="<%= resource_prefix %>assets/css/custom.css" rel="stylesheet">
<link href="<%= resource_prefix %>assets/css/theme.css" rel="stylesheet">
<title><%= title %></title>
</head>