a:link {
  color: blue;
  text-decoration:none;
}

a:visited {
  color: purple;
  text-decoration:none;
}

a:active {
  color: blue;
  background-color: white;
  text-decoration:none;
}

a:hover {
  color: teal;
  background-color:white;
  text-decoration:none;
}