app/views/layouts/_application.html.erb
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><%= t "petitions" %></title>
<%= stylesheet_link_tag 'application', media: 'all' %>
<%= javascript_include_tag 'application' %>
<%= csrf_meta_tags %>
</head>
<body>
<%= render template: "shared/_navigation" %>
<div id="main-container" class="container">
<% flash.each do |name, msg| -%>
<%= content_tag :div, msg, class: "alert alert-#{name}" %>
<% end -%>
<%= yield :head %>
<div class="row">
<div class="col-xs-3">
<%= yield :sidebar %>
</div>
<div class="col-xs-9">
<%= yield %>
</div>
</div>
<%= render 'layouts/user_widget' %>
</div>
</body>
</html>