Maybe/app/views/layouts/auth.html.erb

<%= content_for :content do %>
  <div class="flex flex-col h-screen px-6 py-12 bg-gray-25">
    <div class="grow flex flex-col justify-center">
      <div class="sm:mx-auto sm:w-full sm:max-w-md">
        <div class="flex justify-center mb-6">
          <%= image_tag "logo-color.png", class: "w-16 mb-6" %>
        </div>

        <div class="space-y-2">
          <h2 class="text-3xl font-medium text-gray-900 text-center">
            <%= content_for?(:header_title) ? yield(:header_title).html_safe : t(".your_account") %>
          </h2>

          <% if controller_name == "sessions" %>
            <p class="text-sm text-center">
              <%= tag.span t(".no_account"), class: "text-gray-500" %> <%= link_to t(".sign_up"), new_registration_path, class: "font-medium text-gray-900 hover:underline transition" %>
            </p>
          <% elsif controller_name == "registrations" %>
            <p class="text-sm text-center text-gray-600">
              <%= t(".existing_account") %> <%= link_to t(".sign_in"), new_session_path, class: "font-medium text-gray-900 hover:underline transition" %>
            </p>
          <% end %>
        </div>
      </div>

      <div class="mt-8 sm:mx-auto sm:w-full sm:max-w-lg">
        <%= yield %>
      </div>
    </div>

    <%= render "layouts/footer" %>
  </div>
<% end %>

<%= render template: "layouts/application" %>