Example:
<!doctype html>
<html>
<body>
<p style="color: gray">
Any color whatever it be, is a combination of three colors:
</p>
<ul>
<li style="color: red">Red
</li>
<li style="color: green">Green
</li>
<li style="color: blue">Blue
</li>
</ul>
</body>
</html>
The result will be: