code: @Nonnull
    @Nonempty
    public static String getRGBColorValue (final int nRed, final int nGreen, final int nBlue)
    {
      return new StringBuilder (16).append (CCSSValue.PREFIX_RGB_OPEN)
                                   .append (getRGBValue (nRed))
                                   .append (',')
                                   .append (getRGBValue (nGreen))
                                   .append (',')
                                   .append (getRGBValue (nBlue))
                                   .append (CCSSValue.SUFFIX_RGB_CLOSE)
                                   .toString ();
    }
docs: Get the passed values as CSS RGB color value
  
  @param nRed
  Red - is scaled to 0-255
  @param nGreen
  Green - is scaled to 0-255
  @param nBlue
  Blue - is scaled to 0-255
  @return The CSS string to use