\documentclass[a4paper]{article}
\usepackage[paperwidth=100mm,margin=.1mm,ignoreall]{geometry} % prose
%\usepackage[paperwidth=62.5mm,margin=.1mm,ignoreall]{geometry} % poem
\usepackage[dvipsnames,svgnames]{xcolor}
\usepackage{graphicx,listings}
\usepackage[path={./fonts/}]{rit-fonts}
\newfontfamily\en[Path={./fonts/},Extension=.ttf]%
{Linux-Libertine}
[BoldFont=*-Bold]
\def\thesection{\en\arabic{section}}
\def\thesubsection{\en\thesection.\arabic{subsection}}
\def\f#1{\gdef\thef{\en #1}}
\newfontfamily\lstfont[Scale=.8]{MPLUSCodeLatin}
\usepackage{tcolorbox}
\colorlet{bgcol}{white}
\colorlet{frcol}{black!10}
\def\thetitle{Regular}
\makeatletter
\def\title#1{\def\next{#1}\xdef\thetitle
{\expandafter\strip@prefix\meaning\next}}
\makeatother
\newtcolorbox{prosebox}{colback=bgcol,width=99.8mm, %.63\linewidth,
halign title=flush left,
before=, after=\par\newpage,
% before skip=0\baselineskip, after skip=0\baselineskip,
colbacktitle={black!10},
coltitle=black,
fonttitle=\lstfont\footnotesize,
box align=top,
colframe=frcol,
title={\thetitle}}
%\addfontfeatures{Scale=2,Color=red,Numbers=Lining}
\def\myprose{à´ªàµà´°à´¤à´¿à´°àµ‹à´§à´°à´¾à´·àµà´Ÿàµà´°àµ€à´¯à´µàµà´‚ ആധàµà´¨à´¿à´• കലാപാരമàµà´ªà´°àµà´¯à´™àµà´™à´³à´¿à´²àµ†
വിനിമയവൈà´à´µà´™àµà´™à´³àµà´‚ തമàµà´®à´¿à´²à´¿à´£à´•àµà´•à´¿, അവരവരàµà´Ÿàµ† ദേശീയ കലാസാഹിതàµà´¯à´¤àµà´¤à´¿à´¨àµà´±àµ†
പരമàµà´ªà´°à´¾à´—à´¤ രൂപങàµà´™à´³àµ† à´à´¾à´µàµà´•à´¤àµà´µà´ªà´°à´®à´¾à´¯à´¿ ഉയർതàµà´¤à´¿, നീതിയോടàµàµ à´†à´à´¿à´®àµà´–àµà´¯à´‚ വളർതàµà´¤à´¿,
ഇങàµà´™à´¨àµ† ഒരൠപàµà´°à´¤à´¿à´¸à´‚à´¸àµà´•à´¾à´°à´¤àµà´¤à´¿à´¨àµà´±àµ† ജനകീയവàµà´‚ അഗാധവàµà´‚ സമകാലികവàµà´‚
à´àµ—തികവàµà´®à´¾à´¯ ജാഗàµà´°à´¤ പാകി.}
\def\halfprose{à´ªàµà´°à´¤à´¿à´°àµ‹à´§à´°à´¾à´·àµà´Ÿàµà´°àµ€à´¯à´µàµà´‚ ആധàµà´¨à´¿à´• കലാപാരമàµà´ªà´°àµà´¯à´™àµà´™à´³à´¿à´²àµ†
വിനിമയവൈà´à´µà´™àµà´™à´³àµà´‚ തമàµà´®à´¿àµ½ \dots}
\usepackage[active,luatex,tightpage]{preview}
\renewcommand\PreviewBbAdjust{0pt -5pt 0pt 0pt}
\PreviewEnvironment{prosebox}
\begin{document}
\ifluatex\prehyphenchar="0000\else\defaulthyphenchar="0000\fi
\pagestyle{empty}
\parindent0pt
\parskip=1\baselineskip plus 2pt minus 2pt
\hyphenpenalty=0
\lefthyphenmin=3
\righthyphenmin=3
\tolerance=500
\emergencystretch=1em
\title{RIT Rachana Regular}
\begin{prosebox}
\Rachana
\myprose
\end{prosebox}
\title{RIT Panmana Regular}
\begin{prosebox}
\Panmana
\myprose
\end{prosebox}
\title{RIT MeeraNew}
\begin{prosebox}
\Meera
\myprose
\end{prosebox}
\title{RIT TN Joy}
\begin{prosebox}
\Joy
\myprose
\end{prosebox}
\title{\usepackage[ScaleRM=1.5,...]{rit-fonts}}
\begin{prosebox}
\Rachana
\addfontfeatures{Scale=1.5}
\advance\baselineskip 5pt
\ifluatex\prehyphenchar="0000\else\defaulthyphenchar="0000\fi
\halfprose
\end{prosebox}
\title{\usepackage[Numbers=OldStyle,...]{rit-fonts}}
\begin{prosebox}
\Rachana \addfontfeatures{Numbers=OldStyle}
\ifluatex\prehyphenchar="0000\else\defaulthyphenchar="0000\fi രചനയിൽ
പഴയരീതിയിലàµà´³àµà´³ à´…à´•àµà´•à´™àµà´™à´³àµà´£àµà´Ÿàµàµ. 1234567890. ഇവ സാധാ\-à´°à´£ à´…à´•àµà´•à´™àµà´™à´³àµ† അപേകàµà´·à´¿à´šàµà´šàµàµ
പാഠവàµà´®à´¾à´¯à´¿ à´’à´¤àµà´¤àµà´ªàµ‹à´•àµà´¨àµà´¨à´¤à´¾à´£àµàµ.
\end{prosebox}
\end{document}