link effects?

[xoblivionxfantasyx]

can someone please help me on how to scroll over a link and it to change color because i have tried many things and they don't work

[Twey]

<style type="text/css">
a {
  color: black;
}

a:hover {
  color: green;
}
</style>

[xoblivionxfantasyx]

thank you so much