I want to try a visited color for my categories and see if I like it. Please show me where to enter it in this code:

.betterCategories a, .betterCategories a:visited,
.betterDocuments a, .betterDocuments a:visited,
.betterEzpages a, .betterEzpages a:visited,
.betterInformation a, .betterInformation a:visited,
.betterMoreinformation a, .betterMoreinformation a:visited,
.betterBestsellers a, .betterBestsellers a:visited {
display: block;
background-color: #ffe5ef;
border-bottom:1px dashed #ccc;
padding: 4px;
}

I'm learning so much and my site is really coming along great. Thank you for all of your help!