diff --git a/ptbposter/tcb-example1.pdf b/ptbposter/tcb-example1.pdf
index 0efaa7613d23a824e77c1f31a869a1859a985c72..f32bbf4c52ad77a526b49322744b6244a3705186 100644
Binary files a/ptbposter/tcb-example1.pdf and b/ptbposter/tcb-example1.pdf differ
diff --git a/ptbposter/tcb-example1.tex b/ptbposter/tcb-example1.tex
index b08d8880457d4a7bffa02fdbf615f6f325ef16b1..ab1e0612b941f0acf5d823dabc4b66aa0d234558 100644
--- a/ptbposter/tcb-example1.tex
+++ b/ptbposter/tcb-example1.tex
@@ -21,7 +21,7 @@
 
 %\logo{Logo754.pdf}
 
-\colorlet{boxBackground}{black!5}
+\colorlet{boxBackground}{OliveGreen!10}
 \posterSet{showframe=true,columns=3,rows=5}% columns,rows -> default 
 
 \title{Poster-Test (\texttt{tcolorbox}) -- Nr.~1}