[css] Reduce secondary scrollbars size.

admin_interface/static/admin_interface/css/admin-interface-fix.css

@@ -285,6 +285,10 @@ body.admin-interface .paginator a.showall:visited {
     padding: 10px 15px;
 }
 
+.admin-interface #changelist-form .results {
+    scrollbar-width: thin;
+}
+
 /* begin fix issue #13 - Datetime widget broken in long inlines */
 .admin-interface p.datetime {
     white-space:nowrap;
@@ -331,6 +335,9 @@ body.admin-interface .paginator a.showall:visited {
     position: sticky;
     left: 0;
 }
+.admin-interface .inline-related.tabular fieldset.module table {
+    scrollbar-width: thin;
+}
 .admin-interface .inline-related.tabular fieldset.module table tbody tr {
     position: relative;
 }