diff --git a/backup/util/helper/backup_helper.class.php b/backup/util/helper/backup_helper.class.php
index fba5fa863b9..1334792bb0e 100644
--- a/backup/util/helper/backup_helper.class.php
+++ b/backup/util/helper/backup_helper.class.php
@@ -431,7 +431,7 @@ abstract class backup_helper {
             echo \html_writer::tag(
                 'div',
                 $options,
-                ['class' => 'tertiary-navigation full-width-bottom-border ml-0', 'id' => 'tertiary-navigation']);
+                ['class' => 'container-fluid tertiary-navigation full-width-bottom-border', 'id' => 'tertiary-navigation']);
         } else {
             echo $OUTPUT->heading($current, 2, 'mb-3');
         }