I'm not sure what aspect of programming you're asking about, but when people compose HTML/CSS code for websites, the term "hex code" usually refers to the way colors are encoded using 6-digit hexadecimal (base-16) numbers. For example, the hex code 8B9A18 (or equivalently 8b9a18) corresponds to the green color you see on "Follow" and "submit answer" buttons on Hubpages.
A nice site that shows a full palette of colors along with their hex codes is here:
http://www.december.com/html/spec/color.html
If you want to select you own colors using a color wheel and see the corresponding hex code, you can use this tool here:
http://www.had2know.com/computers/css-c … l-hex.html
When you're specifying the color in an external style sheet or using in-line CSS, you write it like this, color:#8B9A18;
Hope that answers your question.
How it works is that the first two digits of the hex code represent the amount of red light, the second two digits the amount of green light, and the last two the amount of blue light. Each ranges from 00 to FF.
Thank you. I suppose I ought to have asked: How do (base-16) numbers work?
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