diff --git a/src/static/css/2019.css b/src/static/css/2019.css
index d6d741e2e78..05bce32f1e4 100644
--- a/src/static/css/2019.css
+++ b/src/static/css/2019.css
@@ -1491,7 +1491,7 @@ th code {
   padding: 0;
   margin: 0;
   border-radius: 0;
-  background-color: none;
+  background-color: unset;
 }
 
 code {