diff --git a/docs/app/assets/css/docs.css b/docs/app/assets/css/docs.css
index 64f2e4b76ed4..b39adac14ca1 100644
--- a/docs/app/assets/css/docs.css
+++ b/docs/app/assets/css/docs.css
@@ -464,6 +464,10 @@ iframe.example {
   background:rgb(189, 63, 66);
 }
 
+.type-hint-regexp {
+  background: rgb(90, 84, 189);
+}
+
 .runnable-example-frame {
   width:100%;
   height:300px;