There are codes for colors used for websites programming, etc. For example, white would be #FFFFFF, I think.
Imagine you want to know code for this color.
I assume you already have a graphic file that contains the color. In my case, I had a file 2022-05-09_16-26-54.png to show you the box above.
Step 1: Open Paint, which is a software program included in Windows.
Step 2: