diff --git a/ptbletter/ptbletter-doc.pdf b/ptbletter/ptbletter-doc.pdf
index 38991dd4029684484bfba066271a5f5f12c82083..ec86256cdcc7055ea6601fed6bd03bc9423775d5 100644
Binary files a/ptbletter/ptbletter-doc.pdf and b/ptbletter/ptbletter-doc.pdf differ
diff --git a/ptbletter/ptbletter.cls b/ptbletter/ptbletter.cls
index 6cfbffc3969b4e839478f27716d47bf250a53082..65e3cb2bf26e08c162e2031e0acf06e5474adfd2 100644
--- a/ptbletter/ptbletter.cls
+++ b/ptbletter/ptbletter.cls
@@ -297,6 +297,7 @@
 }
 
 \RequirePackage{eso-pic}
+\definecolor{BGtextcolor}{gray}{0.9}
 \AtBeginDocument{%
   \ifx\ptb@overprintI\@empty
     \ifx\ptb@overprintII\@empty\else
@@ -305,7 +306,7 @@
           \makebox(0,0)[c]{\resizebox{\textwidth}{!}{%
             \rotatebox{54.7}{%
               \textnormal{\textsf{\textbf{%
-                \color{lightgray}\ptb@overprintII}}}}}}%
+                \color{BGtextcolor}\ptb@overprintII}}}}}}%
         }%
       }%
     \fi  
@@ -315,7 +316,7 @@
         \makebox(0,0)[c]{\resizebox{\textwidth}{!}{%
           \rotatebox{54.7}{%
             \textnormal{\textsf{\textbf{%
-              \color{lightgray}\ptb@overprintI}}}}}}%
+              \color{BGtextcolor}\ptb@overprintI}}}}}}%
       }%
     }%
   \fi