<%= form_with url:'/test', builder: GOVUKDesignSystemFormBuilder::FormBuilder do |f| %> <%= f.govuk_number_field :age, label: { text: "Age" } %> <%= f.govuk_submit %> <% end %> <%= link_to "/age", class: "govuk-header__link govuk-header__link--homepage" do %> GOV.UK <% end %>