diff --git a/ptbposter/ptbposter-tcb.sty b/ptbposter/ptbposter-tcb.sty
index e4bd790aa8baab26cbf70f45e641b0722453983e..c092a53b36e10fc92fae9a4c9757383bd51f4c25 100644
--- a/ptbposter/ptbposter-tcb.sty
+++ b/ptbposter/ptbposter-tcb.sty
@@ -34,7 +34,7 @@
 \tcbuselibrary{poster}
 \usetikzlibrary{shadings,arrows.meta}
  
-\colorlet{backgroundTop}{Goldenrod2!10}
+\colorlet{backgroundTop}{Goldenrod2!20}
 \colorlet{backgroundBottom}{Goldenrod2!90}
 \colorlet{boxBackground}{white}