diff --git a/themes/bootstrap/scss/_common.scss b/themes/bootstrap/scss/_common.scss
index 0b5e007b4b94..db94b7d46e2a 100644
--- a/themes/bootstrap/scss/_common.scss
+++ b/themes/bootstrap/scss/_common.scss
@@ -984,10 +984,10 @@ select.invalid_value,
   background-image: url("../img/ajax_clock_small.gif");
   background-repeat: no-repeat;
   background-position: 2%;
-  border: 1px solid #e2b709;
-  background-color: #ffe57e;
+  border: 1px solid var(--bs-warning-border-subtle);
+  background-color: var(--bs-warning-bg-subtle);
+  color: var(--bs-warning-text-emphasis);
   border-radius: 5px;
-  box-shadow: 0 5px 90px #888;
 }
 
 #loading_parent {