diff --git a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/config.scrbl b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/config.scrbl
index 5f6471ab..8655ee4e 100644
--- a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/config.scrbl
+++ b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/config.scrbl
@@ -105,7 +105,7 @@ For example, a Scribble document
 combined with an @filepath{inbox.css} that contains
 
 @verbatim[#:indent 2]|{
-  .inbox {
+  .InBox {
     padding: 0.2em;
     border: 1px solid #000000;
   }
diff --git a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/inbox.css b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/inbox.css
index 4cc3a903..d33f2076 100644
--- a/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/inbox.css
+++ b/pkgs/scribble-pkgs/scribble-doc/scribblings/scribble/inbox.css
@@ -1,4 +1,4 @@
-.inbox {
+.InBox {
   padding: 0.2em;
   border: 1px solid #000000;
 }