I could draw a border for a page with
\documentclass{article}
\usepackage[paperwidth=16cm,paperheight=24cm]{geometry}
\usepackage[a4,frame,center]{crop}
\usepackage{lipsum}% dummy text
\begin{document}
\lipsum
\lipsum
\lipsum
\end{document}
How can I draw a vertical line (red line) in the below picture:
\rule
or\line
instead of the image and packagecolor
orxcolor
to select the color.