The following code should exhibit intended functionality:
<head>
<style>
a:active
{
color:teal;
}
a:hover
{
color:green;
...
...
...
<body>
<a href="http://www.google.co.uk">Googs!</a>
...
Switch your CSS rules.
...
a:hover{color: #000;}
a:active{color: #c0c0c0;}
...