[Web] Add overflows in /admin for small devices

data/web/css/mailbox.css

@@ -5,6 +5,17 @@ table.footable>tbody>tr.footable-empty>td {
 .pagination a {
   text-decoration: none !important;
 }
+.panel panel-default {
+  overflow: visible !important;
+}
+.table-responsive {
+  overflow: visible !important;
+}
+@media screen and (max-width: 767px) {
+  .table-responsive {
+    overflow-x: scroll !important;
+  }
+}
 .btn-group {
   width: max-content;
 }