I have tried to play with the line
Code: Select all
\draw[anchor=west] (1.5cm,-5.5cm)
node [rounded corners=20pt,fill=ocre!10!white,text opacity=1,draw=ocre,draw opacity=1,
line width=1.5pt,fill opacity=.85,inner sep=12pt]
{\LARGE\sffamily\bfseries\textcolor{black}{Chapter \thechapter. #1\strut\makebox[22cm]{}}};
thank you.
Best
egiem