diff --git a/ptbposter/ptbposter.cls b/ptbposter/ptbposter.cls
index 1d27b1fcd16d51bfcafec75c608e63422a864857..e1b34cd6c0ad35c51c88661121f6de1229d01da9 100644
--- a/ptbposter/ptbposter.cls
+++ b/ptbposter/ptbposter.cls
@@ -26,6 +26,7 @@
 \newcommand*\authorFontSize{}
 \newcommand*\footFontSize{}
 \newcommand*\titleFontSize{}
+\newcommand*\PTBinnerBG{}
 
 \newcommand\PTB@tempa{}
 \newcommand\PTB@tempb{}
@@ -259,14 +260,14 @@
   \put(\PTB@leftmargin,\PTB@tempdima){\parbox[b]{\PTB@framewidth}{% Autoren
     \PTB@authors@justification\sffamily\authorFontSize\@author}}%
   % hier wird \@thanks gefüllt
-  \linethickness{\PTB@framethickness}\color{PTBcolor}%\color{PTBcolor}%
+  \linethickness{\PTB@framethickness}\color{PTBcolor}%
   \PTB@tempdima=-0.0883095039717\PTB@scale@base
   \put(\PTB@leftmargin,\PTB@tempdima){%
     \line(1,0){\dimexpr\paperwidth-2\PTB@leftmargin}}%
   % blauer Rahmen
   \put(\PTB@leftmargin,\dimexpr-\textheight-2\PTB@textvsep-\PTB@topmargin)%
     {\framebox(\dimexpr\textwidth+2\PTB@texthsep,%
-     \dimexpr\textheight+2\PTB@textvsep){}}%
+     \dimexpr\textheight+2\PTB@textvsep){\PTBinnerBG}}%
 }
 
 \AddToShipoutPictureFG*{% Fuß (relativ zur unteren Kante des Textbereichs)