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

<%= render "layouts/shared/htmldoc" do %>
  <div class="flex h-full bg-gray-50">
    <nav class="flex flex-col shrink-0 w-[84px] py-4 mr-3">
      <div class="pl-2 mb-3">
        <%= link_to root_path, class: "block" do %>
          <%= image_tag "logomark-color.svg", class: "w-9 h-9 mx-auto" %>
        <% end %>
      </div>

      <ul class="space-y-0.5">
        <li>
          <%= render "layouts/sidebar/nav_item", name: "Home", path: root_path, icon_key: "pie-chart" %>
        </li>

        <li>
          <%= render "layouts/sidebar/nav_item", name: "Transactions", path: transactions_path, icon_key: "credit-card" %>
        </li>

        <li>
          <%= render "layouts/sidebar/nav_item", name: "Budgets", path: budgets_path, icon_key: "layout-grid" %>
        </li>
      </ul>

      <div class="pl-2 mt-auto mx-auto">
        <%= render "users/user_menu", user: Current.user %>
      </div>
    </nav>

    <%= tag.div class: class_names("py-4 shrink-0 h-full overflow-y-auto transition-all duration-300", Current.user.show_sidebar? ? "w-[260px]" : "w-0"), data: { sidebar_target: "panel" } do %>
      <% if content_for?(:sidebar) %>
        <%= yield :sidebar %>
      <% else %>
        <div id="account-sidebar-tabs" data-turbo-permanent>
          <%= render "accounts/account_sidebar_tabs", family: Current.family %>
        </div>
      <% end %>
    <% end %>

    <%= tag.main class: class_names("px-10 py-4 grow h-full", require_upgrade? ? "relative overflow-hidden" : "overflow-y-auto") do %>
      <% if require_upgrade? %>
        <div class="absolute inset-0 px-10 h-full w-full z-50">
          <%= render "shared/subscribe_modal" %>
        </div>
      <% end %>

      <%= tag.div class: class_names("mx-auto w-full h-full", Current.user.show_sidebar? ? "max-w-4xl" : "max-w-5xl"), data: { sidebar_target: "content" } do %>
        <% unless controller_path.start_with?('settings/') %>
          <% if content_for?(:breadcrumbs) %>
            <%= yield :breadcrumbs %>
          <% else %>
            <%= render "layouts/shared/breadcrumbs", breadcrumbs: @breadcrumbs %>
          <% end %>
          
          <% if content_for?(:page_header) %>
            <%= yield :page_header %>
          <% end %>
        <% end %>
        <%= yield %>
      <% end %>
    <% end %>
  </div>
<% end %>