acomodar la sección de usuaries al resto del sitio

app/views/usuaries/index.haml

@@ -1,27 +1,24 @@
-.row
-  .col
+.row.justify-content-center
+  .col.col-md-8
     %h1= t('.title')
 
-.row
-  .col
     -# Una tabla de usuaries y otra de invitades, con acciones
     - %i[usuaries invitades].each do |u|
-      %h2
-        = t(".#{u}")
-        .btn-group{ role: 'group', 'aria-label': t('.actions') }
-          - if @policy.invite?
-            = link_to t('.invite'),
-              site_usuaries_invite_path(@site, invite_as: u.to_s),
-              class: 'btn',
-              data: { toggle: 'tooltip' },
-              title: t('.help.invite', invite_as: u.to_s)
-          - if policy(Collaboration.new(@site)).collaborate?
-            = link_to t('.public_invite'),
-              site_collaborate_path(@site),
-              class: 'btn',
-              data: { toggle: 'tooltip' },
-              title: t('.help.public_invite')
-      %p= t(".help.#{u}")
+      %h2.mt-5= t(".#{u}")
+      .btn-group{ role: 'group', 'aria-label': t('.actions') }
+        - if @policy.invite?
+          = link_to t('.invite'),
+            site_usuaries_invite_path(@site, invite_as: u.to_s),
+            class: 'btn',
+            data: { toggle: 'tooltip' },
+            title: t('.help.invite', invite_as: u.to_s)
+        - if policy(Collaboration.new(@site)).collaborate?
+          = link_to t('.public_invite'),
+            site_collaborate_path(@site),
+            class: 'btn',
+            data: { toggle: 'tooltip' },
+            title: t('.help.public_invite')
+      %p.lead= t(".help.#{u}")
       %table.table.table-condensed
         %tbody
           - @site.send(u).each do |cuenta|

app/views/usuaries/invite.haml

@@ -1,11 +1,9 @@
 - invite_as = t("usuaries.invite_as.#{params[:invite_as]}")
 
-.row
-  .col
+.row.justify-content-center
+  .col.col-md-8
     %h1= t('.title', invite_as: invite_as)
 
-.row
-  .col
     = form_with url: site_usuaries_invite_path(@site), local: true do |f|
       = f.hidden_field :invited_as, value: params[:invite_as].singularize
       .form-group