This color selector has 3 input boxes and 6 output boxes.
For practice, input fe9810 (or FE9810 - input is not case sensitive.) Click the ENTER box directly to the right of that input box. The background color changes to the HEX# color value and the other 2 input boxes display the HEX # converted into RGB and Decimal values. The formatted output boxes display the same information except it is much easier to read.

The text color changes to the inverse of the color value that was input. For example, if you input the value for blue 0000FF, then the text color will change to yellow FFFF00.

You can use any of the three input boxes just remember not to input commas or spaces.