coloring the links in CSS

How to color the links in CSS?

Example:

<html>
<head>
<style>
/* link is not visited still */
a:link {
color: green;
}/* link is visited before */
a:visited {
color: blue;
}/* when mouse reached the link */
a:hover {
color: pink;
}/* Link is opened at the current moment */
a:active {
color: red;
}

</style>
</head>
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</html>