Link CSS in Twenty Twelve

I am having trouble getting the css code for links to show up in my site.

I’m using this css:

a:link {
color:#a64814;
}
a:visited {
color:#8c451e;
}
a:hover {
color:#b6b8b5;
}

It shows up as I’d like it to in the blog <http://jstoneenamels.com/wordpress/blog/&gt;, but not on pages <http://jstoneenamels.com/wordpress/about/&gt;.
What am I doing wrong?

Thanks for any help you can give.
Amy