diff --git a/doc/api_assets/hljs.css b/doc/api_assets/hljs.css
index 86bd405709276c..91cece59e7cced 100644
--- a/doc/api_assets/hljs.css
+++ b/doc/api_assets/hljs.css
@@ -49,7 +49,7 @@
     color: #808080;
   }
   .hljs-attr {
-    color: #f00;
+    color: #d00;
   }
   .hljs-symbol,
   .hljs-bullet,