make derived cs posterbox lowercase

CS.tex

@@ -153,7 +153,7 @@ circle label/.style = {
     opacityback=0,
     remember,
   ]
-  {name=Derived,column=2,row=6,span=18,rowspan=4}{
+  {name=derived,column=2,row=6,span=18,rowspan=4}{
     \renewcommand{\arraystretch}{.1}
     \addtolength{\tabcolsep}{-0.2em}
     \begin{tabularx}{\linewidth}{XXXX}