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\documentclass[12pt,letterpaper]{article}\usepackage[T1]{fontenc}% Code to add a vertical gray band in the inner margin :\usepackage{eso-pic}\definecolor{colorMarge}{RGB}{242,242,245}\newlength{\distance}\setlength{\distance}{0.0in} % 0.5in\newlength{\rulethickness}\setlength{\rulethickness}{0.5in} % 1pt\newlength{\ruleheight}\setlength{\ruleheight}{11in} % Longueur de la ligne\newlength{\xoffset}\newlength{\yoffset}\setlength{\yoffset}{0.5\dimexpr\paperheight-\ruleheight}\AddToShipoutPicture{%\ifodd\value{page}%\setlength{\xoffset}{\distance}%\else\setlength{\xoffset}{\dimexpr\paperwidth-\rulethickness-\distance}%\fi\AtPageLowerLeft{\put(\LenToUnit{\xoffset},\LenToUnit{\yoffset}){\color{colorMarge}\rule{\rulethickness}{\ruleheight}}}%}\begin{document}Test\newpageAnother page\end{document}