diff --git a/assets/config/bootstrap-pre-customize.scss b/assets/config/bootstrap-pre-customize.scss
index 0116b22d..88845197 100644
--- a/assets/config/bootstrap-pre-customize.scss
+++ b/assets/config/bootstrap-pre-customize.scss
@@ -1,41 +1,38 @@
 /**
- * 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
  */
 
 // override some global bootstrap sass variables before generating stylesheets
 
 // global text colors and fonts
 $primary: #e20026;
 $body-color: rgba(0, 0, 0, 0.55);
 $font-family-sans-serif: "Alegreya Sans", sans-serif !important;
 $link-color: rgba(0, 0, 0, 0.75);
 $code-color: #c7254e;
 
 // headings
 $headings-line-height: 1.1;
 $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;
 $dropdown-item-padding-y: 0;
 
 // card header padding
 $card-spacer-y: 0.5rem;
 
 // nav pills colors
 $nav-pills-link-active-color: rgba(0, 0, 0, 0.55);
 $nav-pills-link-active-bg: #f2f4f5;
 
 // table cell padding
 $table-cell-padding: 0.4rem;
 
 // remove container padding
 $grid-gutter-width: 0;