diff --git a/app/views/report_mailer/tables_report.html.erb b/app/views/report_mailer/tables_report.html.erb
index f102bfea68c..403db2ce5fa 100644
--- a/app/views/report_mailer/tables_report.html.erb
+++ b/app/views/report_mailer/tables_report.html.erb
@@ -10,7 +10,7 @@
         height: 21,
       ) %>
 </header>
-<hr class="height-05 margin-bottom-4 border-transparent">
+<hr class="height-05 margin-bottom-4 border-transparent bg-secondary">
 <%= @message %><br>
 <% @reports.each do |report| %>
   <% header, *rows = report.table %>
@@ -47,4 +47,4 @@
     </tbody>
   </table>
 <% end %>
-<hr class="height-05 margin-top-4 border-transparent">
+<hr class="height-05 margin-top-4 border-transparent bg-secondary">