app/views/layouts/errors.html.haml


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!!! 5
%html{ lang: "en" }
  %head
    %meta{ :content => "width=device-width, initial-scale=1, maximum-scale=1", :name => "viewport" }
    %title= yield(:title)
    %style
      = Rails.application.assets_manifest.find_sources('errors.css').first.to_s.html_safe
  %body
    .page-container
      = yield
    = javascript_tag nonce: true do
      :plain
        (function(){
          var goBackElement = document.querySelector('.js-go-back');

          if (goBackElement && history.length > 1) {
            goBackElement.removeAttribute('hidden');

            goBackElement.querySelector('button').addEventListener('click', function() {
              history.back();
            });
          }
        }());