diff --git a/addons/mail/__manifest__.py b/addons/mail/__manifest__.py
index c65d02a5f0f..d58739e6331 100644
--- a/addons/mail/__manifest__.py
+++ b/addons/mail/__manifest__.py
@@ -73,6 +73,8 @@
             'web/static/src/libs/bootstrap/pre_variables.scss',
             'web/static/lib/bootstrap/scss/_variables.scss',
             'web/static/src/legacy/scss/import_bootstrap.scss',
+            'web/static/src/libs/bootstrap/utilities_custom.scss',
+            'web/static/lib/bootstrap/scss/utilities/_api.scss',
             'web/static/src/legacy/scss/bootstrap_review.scss',
             'web/static/src/webclient/webclient.scss',
             'web/static/src/webclient/webclient_extra.scss',
diff --git a/addons/web/static/src/libs/bootstrap/utilities_custom.scss b/addons/web/static/src/libs/bootstrap/utilities_custom.scss
index 0103d2cb8d8..c9283db2565 100644
--- a/addons/web/static/src/libs/bootstrap/utilities_custom.scss
+++ b/addons/web/static/src/libs/bootstrap/utilities_custom.scss
@@ -79,6 +79,8 @@ $utilities: map-merge(
                 "text-opacity": 1
             ),
             values: (
+                "black": $black,
+                "white": $white,
                 "muted": $text-muted,
                 "black-50": rgba($black, .5), // deprecated
                 "white-50": rgba($white, .5), // deprecated