app/features/global/layout.erb
<!DOCTYPE html>
<html>
<head>
<title>fastlane CI</title>
<link rel="stylesheet" href="/custom.css">
<link rel="stylesheet" href="/material.min.css">
<script src="/material.min.js"></script>
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="icon" type="image/x-icon" href="/favicon.ico">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<%= erb :"../../global/notification_banner" %>
<%= yield %>
</body>
</html>