Style.css Problem with text color

[bvu007]

Hi,
I use Web Developer 1.1.3 to identify the sections
of my template to modify color within style.css.
I'd like to modify the color of the text of category and album list.

In the following section it works fine
.tableh1 {
        /*background : #0E72A4 ;*/
   background : #999966;
        color : #FFFFFF;
        padding-top: 3px;
        padding-right: 10px;
        padding-bottom: 3px;
        padding-left: 10px;
}

however not in this one:
a {
        color : #FFFFFF ;
        text-decoration: none;
}

a:hover {
        color : #FFFFFF ;
        text-decoration: underline;
}

Anyone has any idea how to troubleshoot?
Thanks
Bodo