\AtEndOfPackage{
  \setlength{\shadeboxsep}{2pt}  
  \setlength{\shadedtextwidth}{\textwidth}
  \addtolength{\shadedtextwidth}{-.5in}
  \addtolength{\shadedtextwidth}{-2\shadeboxsep}
  \setlength{\shadeleftshift}{.25in} 
  \setlength{\shaderightshift}{0in}
  \definecolor{shadethmcolor}{gray}{.92}  
  \definecolor{shaderulecolor}{gray}{.92}
  \setlength{\shadeboxrule}{0pt}  
}