Hi Grzegorz, Yes I´m using Haml markup. The complete code is:

  .row.flex-box-center
  .col.s12.m10.force_margin
    .card.card-cascade.narrower.pt-0.light-1
      .view.view-cascade.gradient-card-header.gradient-blue.narrower.py-3.mx-4.d-flex.justify-content-between.align-items-center
        = link_to dashboard_path, role: "button", class: "btn btn-outline-white btn-rounded btn-sm px-2", title: t("base.forms.back") do
          %i.fas.fa-chevron-left
        %h3.center.mt-2
          %strong
            Devices
        = link_to new_thing_path, role: "button", class: "btn btn-outline-white btn-rounded btn-sm px-2", title: t("things.index.new") do
          %i.fas.fa-plus    
      .card-header.mt-4    
        = form_tag(things_path, method: :get, class:"form-inline justify-content-around")
        = text_field_tag(:search, params[:search], {class: "form-control mr-sm-2", placeholder: "Search"})
        = select_tag "status", options_for_select_status(''), {include_blank: "Status", class: "form-control mr-sm-2", :searchable => "Search here..."}
        = select_tag "customer", options_for_select_customer(@current_user.company_id, ''), {include_blank: "Customer", class: "form-control mr-sm-2", :searchable => "Search here..." }
        %button.btn.btn-outline-success{:type => "submit"} Search
      .card.py-0
        .card-body
          //.table-responsive
          .device-tableWrapper
            %table#device-table.table.table-striped.table-bordered.table-hover.table-sm.btn-table{:cellspacing => "0", :width => "100%"}
              %caption 
                = "#{t('base.forms.list_of')}#{t('things.index.device')}"
              %thead.secondary-color.white-text.align-center
                %tr
                  %th
                    =t("things.index.code")
                  %th
                    =t("things.index.thing_name")
                  %th
                    =t("things.index.status")
                  %th
                    =t("orders.index.order")
                  %th
                    =t("things.index.thing_desc")
                  %th
                    =t("things.index.ini_address")
                  %th
                    =t("things.index.end_address")
                  %th
                    =t("things.index.customer")
                  %th.th-sm
                    =t("base.forms.options")
              %tbody
                - @things.each do |thing|
                  %tr
                    %td= thing.code_scan
                    %td= thing.name
                    %td= thing.status.description
                    - if thing.order
                      %td.align-center= link_to thing.order.status.description, show_order_path(thing.order.slug), class: 'btn btn-sm btn-primary', title: "Order #{thing.order.id}"
                    - else
                      %td 'NA'
                    %td= thing.description
                    %td= thing.initial_address
                    %td= thing.final_address
                    %td= thing.user ? "#{thing.user.first_name} #{thing.user.last_name}" : 'NA'
                    %td.align-center
                      .btn-group-vertical{"aria-label" => "button group", :role => "group"}
                        = link_to show_thing_path(thing.slug), class: 'card__button btn btn-primary btn-sm', title: 'Details' do
                          %i.fas.fa-info
                        = link_to edit_thing_path(thing.slug), class: 'card__button btn btn-success btn-sm', title: 'Update' do
                          %i.fas.fa-edit
                        -# = link_to destroy_thing_path(thing.slug), method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn red btn-space', title: "Eliminar" do
                        -#   %i.medium.material-icons delete_forever
            -# .apple_pagination.center
            -#   .page_info
            -#     = page_entries_info @things
            -#   = will_paginate @things, container: false