diff --git a/lib/rdoc/generator/template/darkfish/css/rdoc.css b/lib/rdoc/generator/template/darkfish/css/rdoc.css
index a44383d485..c53cbd4082 100644
--- a/lib/rdoc/generator/template/darkfish/css/rdoc.css
+++ b/lib/rdoc/generator/template/darkfish/css/rdoc.css
@@ -617,7 +617,7 @@ main .method-detail {
 
 main .method-detail:target {
   margin-left: -10px;
-  border-left: 10px solid #f1edba;
+  border-left: 10px solid var(--source-code-background-color);
 }
 
 main .method-header {