pokemon.trade/app/views/layouts/application.html.haml

!!!
%html
  %head
    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
    %title PokemonTrade
    = csrf_meta_tags
    = csp_meta_tag

    = javascript_pack_tag 'frontend'
    -#= stylesheet_pack_tag 'frontend/assets/stylesheets/app'
  %body
    = yield