!!!
%html
  %head
    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
    %title Shopping cart
    = stylesheet_link_tag    "shopping_cart/application", media: "all"
    = javascript_include_tag "shopping_cart/application"
    = csrf_meta_tags
  %body
    .container
      - flash.each do |key, value|
        = content_tag :div, value,
                      class: "flash #{key} alert alert-warning",
                      role: 'alert'
      = yield