diff --git a/static/themes/default/css/main.css b/static/themes/default/css/main.css
index b18e180c0..8186ce860 100644
--- a/static/themes/default/css/main.css
+++ b/static/themes/default/css/main.css
@@ -71,7 +71,7 @@ h6:not(:first-child) {
     display: block;
     margin-top: 0.3125rem;
     margin-bottom: 0.625rem;
-    color: var(--bs-secondary);
+    color: var(--bs-secondary-color);
 }
 
 /* .close was renamed to .alert-dismissable.btn-close in Bootstrap 5, needs