I want to change selected text's color or to change highlighting color,
and background in line numbers in RichTextFx, but I don't know how to do it, I need your help !
.styled-text-area .selection {
-fx-fill: pink;
}
save this as a file say styled-text-area.css
put this file in same package with your application class
in your class, import this file like
area.getStylesheets().add(getClass().getResource("styled-text-area.css").toExternalForm());
this will make selection color pink
by following here and adding related style rules in styled-text-area.css
you can achieve your other needs.