Type your color in the box in the left, it doesn't matter the format and how you space the values.
You can also try with a keyword.
All of the major browsers have included support for a special set of 140 colors that are recognized by their color name within HTML or CSS code.
This means that rather than having to remember that the color orange is specified with the hex code "#8B008B", you can simply type the word "darkmagenta" when specifying a color in your code and the browser will automatically translate it to its hex value.
In the left is a handy reference list of all 140 browser-supported named colors, sorted alphabetically.