+
+\usepackage{framed}
+%\newenvironment{chapterabstract}{\begin{quotation}\em\noindent}{\end{quotation}} %chktex 6
+\definecolor{lstbg}{gray}{.95}
+\definecolor{shadecolor}{named}{lstbg}
+\newenvironment{chapterabstract}{\begin{shaded}\em\noindent}{\end{shaded}} %chktex 6