what are codes for changing background color??

Question

for black it is 00000
for blue it is 00099
i need for other colors

Answer 1

W3schools color picker is the best:
https://www.w3schools.com/colors/colors_picker.asp

Answer 2

https://code.sololearn.com/WPN1nDX3v0O9/?ref=app

Answer 3

https://www.sololearn.com/learn/HTML/1036/?ref=app
https://en.m.wikipedia.org/wiki/Web_colors
https://www.computerhope.com/htmcolor.htm
here you go

Answer 4

Calviղ it seems,there is an error!!

please correct it