app/views/layouts/application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>TaskTracer</title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>
<%= csrf_meta_tags %>
</head>
<body>
<%= render 'layouts/header' %>
<div class="container">
<% convert_bootstrap_flash_type.each do |message_type, message| %>
<div class="alert alert-<%= message_type %>"><%= message %></div>
<% end %>
<%= yield %>
</div>
</body>
</html>