a.ex1:hover, a.ex1:active {color: red;}
a.ex2:hover, a.ex2:active {font-size: 150%;}
a.ex3:hover, a.ex3:active {background: red;}
a.ex4:hover, a.ex4:active {font-family: monospace;}
a.ex5:visited, a.ex5:link {text-decoration: none;}
a.ex5:hover, a.ex5:active {text-decoration: underline;}