How color single page within margin?

Question

How do I color a page within the margin and still being able to write text on the page? I would like to make something like this.

Answer 1

You can e.g. use eso-pic:

\documentclass{article}
\usepackage{eso-pic,xcolor,lipsum}
\begin{document}
\AddToShipoutPictureBG*
  {\AtTextLowerLeft{\textcolor{green!50!white}{\rule{\textwidth}{\textheight}}}}

\lipsum
\end{document}

Answer 2

If you are using OpTeX, you can use \pgbackground tokens register and create \hrule with desired dimensions shifted by \voffset and \hoffset:

\colordef\LiGreen{.2\Green+.03\Black}

\newbox\bgbox
\setbox\bgbox=\vbox{\LiGreen\hrule height\dimexpr\vsize+3pt width\hsize}
\pgbackground={\kern\voffset \moveright\hoffset\copy\bgbox}

\lorem[1-10]

\bye