\startenvironment about-environment

\setupbodyfont
  [pagella]

\usemodule
  [abr-02,narrowtt]

\definecolor [maincolor] [.6(orange)]

\setupwhitespace
  [big]

\setuptyping
  [color=maincolor]

\setuptype
  [color=maincolor]

\setupitemgroup
  [itemize]
  [each]
  [color=maincolor,
   symcolor=maincolor]

\setupcaptions
  [color=maincolor]

\setuphead
  [chapter]
  [before=,
   after={\blank[2*big]},
   style=\bfc,
   color=maincolor]

\setuphead
  [section]
  [before={\blank[2*big]},
   after=\blank,
   style=\bfb,
   color=maincolor]

\setuphead
  [subsection]
  [before=\blank,
   after=\blank,
   style=\bfa,
   color=maincolor]

\setuplayout
  [width=middle,
   height=middle,
   header=0cm,
   topspace=2cm,
   bottomspace=1cm,
   footer=1cm,
   footerdistance=.5cm]

\setupfootertexts
  [][{\getmarking[chapter]\hbox to 2em{\hss\pagenumber}}]
  [{\hbox to 2em{\pagenumber\hss}\getmarking[chapter]}][]

\setuppagenumbering
  [alternative=doublesided]

\startMPextensions
  % color maincolor ; maincolor := \MPcolor{maincolor} ;
    string maincolor ; maincolor := "maincolor" ;
\stopMPextensions

\stopenvironment