\startenvironment spacing-style

\setupbodyfont
  [pagella]

\setuplayout
  [width=middle,
   height=middle,
   topspace=15mm,
   header=15mm,
   footer=0pt,
   bottomspace=20mm]

\setuppagenumbering
  [alternative=doublesided]

\setupwhitespace
  [big]

\definecolor
  [blackcolor]
  [r=0,b=0,g=0]

\definecolor
  [whitecolor]
  [r=1,b=1,g=1]

\definecolor
  [maincolor]
  [.25(blackcolor,green)]

\definecolor
  [extracolor]
  [.25(whitecolor,green)]

% \blackrule[color=maincolor,width=10cm,,height=10cm]
% \blackrule[color=extracolor,width=10cm,,height=10cm]

\setuptyping
  [color=maincolor]

\setuptype
  [color=maincolor]

\setuphead
  [chapter]
  [style=\bfd,
   color=maincolor]

\setuphead
  [section]
  [style=\bfc,
   color=maincolor]

\stopenvironment