freepascal.compiler/docs/crtex/ex13.pp

Program Example13;
uses Crt;

{ Program to demonstrate the TextBackground function. }

begin
  TextColor(White);
  WriteLn('This is written in with the default background color');
  TextBackground(Green);
  WriteLn('This is written in with a Green background');
  TextBackground(Brown);
  WriteLn('This is written in with a Brown background');
  TextBackground(Black);
  WriteLn('Back with a black background');
end.