= form_for site, html: { class: form_class(site) } do |f|
  - unless site.persisted?
    .form-group#design_id
      - if invalid? site, :design_id
        = render 'bootstrap/alert' do
          = t('activerecord.errors.models.site.attributes.design_id.layout_incompatible.help',
            layouts: site.incompatible_layouts.to_sentence)
      
      = render 'designs_desktop', site: @site, designs: @designs 
      = render 'designs_mobile', site: @site, designs: @designs 
      = render 'designs_buttons', site: @site, designs: @designs