diff --git a/packages/test-in-browser/driver.css b/packages/test-in-browser/driver.css
index 7b9bf2fb95..f9506bd2a7 100644
--- a/packages/test-in-browser/driver.css
+++ b/packages/test-in-browser/driver.css
@@ -141,7 +141,7 @@ body {
   text-decoration: none;
 }
 .string_equal_expected ins {
-  background: #fe0;
+  background: #ed0;
 }
 .string_equal_actual ins {
   color: #d00;