code: def b_rgb(self, r, g, b, text=None, fore=None, style=None):
          
          return self.chained(text=text, fore=fore, back=(r, g, b), style=style)
docs: A chained method that sets the back color to an RGB value.
              Arguments:
                  r     : Red value.
                  g     : Green value.
                  b     : Blue value.
                  text  : Text to style if not building up color codes.
                  fore  : Fore color for the text.
                  style : Style for the text.