diff --git a/assets/config/bootstrap-pre-customize.scss b/assets/config/bootstrap-pre-customize.scss
--- a/assets/config/bootstrap-pre-customize.scss
+++ b/assets/config/bootstrap-pre-customize.scss
@@ -1,5 +1,5 @@
 /**
- * Copyright (C) 2018-2019  The Software Heritage developers
+ * Copyright (C) 2018-2022  The Software Heritage developers
  * See the AUTHORS file at the top-level directory of this distribution
  * License: GNU Affero General Public License version 3, or any later version
  * See top-level LICENSE file for more information
@@ -19,9 +19,6 @@
 $headings-color: #e20026;
 $headings-font-family: "Alegreya Sans", sans-serif !important;
 
-// remove the ugly box shadow from bootstrap 4.x
-$input-btn-focus-width: 0;
-
 // dropdown menu padding
 $dropdown-padding-y: 0.25rem;
 $dropdown-item-padding-x: 0;