\AtEndOfPackage{
  \setlength{\boxboxsep}{1pt}  
  \setlength{\boxdtextwidth}{\textwidth-2cm}
  \addtolength{\boxdtextwidth}{-.5in}
  \addtolength{\boxdtextwidth}{-2\boxboxsep}
  \setlength{\boxleftshift}{.3in} 
  \setlength{\boxrightshift}{.3in}
  \definecolor{boxthmcolor}{gray}{0.8}  
  \definecolor{boxrulecolor}{gray}{0.25}
  \setlength{\boxboxrule}{1pt}  
}