diff --git a/sphinx/themes/classic/theme.conf b/sphinx/themes/classic/theme.conf
index d7389eaa0..cd16f4b47 100644
--- a/sphinx/themes/classic/theme.conf
+++ b/sphinx/themes/classic/theme.conf
@@ -25,8 +25,8 @@ headtextcolor    = #20435c
 headlinkcolor    = #c60f0f
 linkcolor        = #355f7c
 visitedlinkcolor = #355f7c
-codebgcolor      = #eeffcc
-codetextcolor    = #333333
+codebgcolor      = unset
+codetextcolor    = unset
 
 bodyfont = sans-serif
 headfont = 'Trebuchet MS', sans-serif