how to add fanctoin to links in css

1<!--the frist one turn it red when your mouse on it 
2the 2end one get bigger when your mouse on it 
3the 3rd one turn ir backround red when your mouse on it 
4the 4th chage litte bit (Idk how to explan it)
5the 5th underline the link when your mouse on it -->
6<style>
7a.ex1:hover, a.ex1:active {color: red;}
8a.ex2:hover, a.ex2:active {font-size: 150%;}
9a.ex3:hover, a.ex3:active {background: red;}
10a.ex4:hover, a.ex4:active {font-family: monospace;}
11a.ex5:visited, a.ex5:link {text-decoration: none;}
12a.ex5:hover, a.ex5:active {text-decoration: underline;}
13</style>