CSS Classes and Subclass

Main link Class

Link One

a.link:active {font-size: 18px; text-decoration:none; color: blue;}
a.link:visited {font-size: 18px; text-decoration:none; color: blue;}
a.link:hover {text-decoration:underline; background-color: #cccccc; color: blue;}
a.link:link {font-size: 18px; text-decoration:none; color: blue;}

Sublink Class

Sublink

a.sub:active {text-decoration:none; font-size: 10px;}
a.sub:visited {text-decoration:none; font-size: 10px;}
a.sub:link {text-decoration:none; font-size: 10px;}
a.sub:hover {text-decoration:underline; background-color: yellow;}

You must override all the declared selectors.