BODY { color: navy; }

a.ex1:link { color: blue ; background: silver }
a.ex1:visited { color: purple ; background: silver }
a.ex1:hover { color: red ; background: silver } 

a.ex2:link { color: blue ; background: white }
a.ex2:visited { color: purple ; background: white }
a.ex2:hover { color: red ; background: white }