a tag hover, active and visited don't work

[Silh]

I put an a tag around some text and give it an id "mainpage". Then I add CCS for "mainpage", but somehow hover, active and visted effects are not showing at all. Did I do something wrong defining them? I am a newbie and very confused...please help!\[code\]#mainpage { color: white; text-decoration: none; font-family: Georgia; font-size: 100px; color: white; text-shadow: 0px 0px 1px white; }#mainpage a:hover{ color: yellow; text-decoration: none; font-family: Georgia; font-size: 100px; color: white; text-shadow: 0px 0px 1px yellow; }#mainpage a:active { color: yellow; text-decoration: none; font-family: Georgia; font-size: 100px; color: white; text-shadow: 0px 0px 1px yellow; }#mainpage a:visited { color: white; text-decoration: none; font-family: Georgia; font-size: 100px; color: white; text-shadow: 0px 0px 1px white; }\[/code\]