diff --git a/mkdocs/themes/mkdocs/css/base.css b/mkdocs/themes/mkdocs/css/base.css
index f5f27ba7..76f9673c 100644
--- a/mkdocs/themes/mkdocs/css/base.css
+++ b/mkdocs/themes/mkdocs/css/base.css
@@ -56,7 +56,7 @@ h2, h3, h4, h5, h6 {
 }
 
 hr {
-    border-top: 1px solid #aaa;
+    border-top: 1px solid var(--bs-border-color);
     opacity: 1;
 }