las tablas con cabeceras sticky usan el color de fondo del theme

app/assets/stylesheets/application.scss

@@ -126,6 +126,7 @@ ol.breadcrumb {
   color: var(--foreground);
 }
 
+.table tr.sticky-top,
 .form-control,
 .custom-file-label {
   background-color: var(--background);

app/views/posts/index.haml

@@ -71,8 +71,8 @@
         %table.table{ data: { controller: 'reorder' } }
           %caption.sr-only= t('posts.caption')
           %thead
-            %tr
-              %th.border-0.background-white.position-sticky{ style: 'top: 0; z-index: 2', colspan: '4' }
+            %tr.sticky-top
+              %th.border-0{ colspan: '4' }
                 .d-flex.flex-row.justify-content-between
                   %div
                     = submit_tag t('posts.reorder.submit'), class: 'btn'

app/views/stats/index.haml

@@ -44,7 +44,7 @@
               %col
               %col
             %thead
-              %tr.sticky-top.background-white
+              %tr.sticky-top
                 %th{ scope: 'col' }= t(".columns.#{column}.column")
                 %th{ scope: 'col' }= t('.columns.visits')
             %tfoot