diff --git a/docs/app/assets/css/docs.css b/docs/app/assets/css/docs.css
index f9f0253ca..2a012c079 100644
--- a/docs/app/assets/css/docs.css
+++ b/docs/app/assets/css/docs.css
@@ -466,6 +466,10 @@ iframe.example {
   background:rgb(189, 63, 66);
 }
 
+.type-hint-regexp {
+  background: rgb(90, 84, 189);
+}
+
 .runnable-example-frame {
   width:100%;
   height:300px;