diff --git a/css/zenwritten-dark.css b/css/zenwritten-dark.css
index 4c80e5a070..51133a999e 100644
--- a/css/zenwritten-dark.css
+++ b/css/zenwritten-dark.css
@@ -20,6 +20,8 @@
   --red: #de6e7c;
   --black: #191919;
   --name: 'zenwritten_dark';
+  --Luma: 0.0980392156862745;
+  --Contrast: 0.635294117647059;
   --IsBright: 0;
   --IsDark: 1;
 }