diff --git a/doc/source/ystatic/dark_theme.css b/doc/source/ystatic/dark_theme.css
index 6de200d82..4a8a7f859 100644
--- a/doc/source/ystatic/dark_theme.css
+++ b/doc/source/ystatic/dark_theme.css
@@ -20,7 +20,7 @@ body {
 }
 
 .rst-content .highlighted {
-  background: #030;
+  background: #333;
   box-shadow: none;
 }