diff --git a/static/css/app.css b/static/css/app.css
index c875125..1fae5ce 100644
--- a/static/css/app.css
+++ b/static/css/app.css
@@ -231,6 +231,7 @@
 
 #results td div span.null {
   color: #bbb;
+  text-transform: uppercase;
 }
 
 #results th:first-child,