app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title><%= t(:title) %></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" type="image/x-icon" href="/holy-image-48.png">
<link rel="stylesheet" href="/instagram.min.css">
<%= csrf_meta_tags %>
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
</head>
<body>
<header class="menu">
<div class="menu-wrapper">
<div class="site-menu">
<%= render "layouts/user" %>
</div>
<div class="site-name">
<%= link_to t(:title_short), controller: "index", action: "index" %>
</div>
</div>
</header>
<div class="container">
<%= yield %>
<footer>
<%= link_to t(:title_short), controller: "index", action: "index" %> © 2018</a>
</footer>
</div>
</body>
</html>