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Classes are defined in the file style.css that is included with the theme. Look for lines like the following....
.outer {border: 1px solid silver;}
.head {background-color: #555555; padding: 5px; font-weight: bold;}
.even {background-color: #999999; padding: 5px; color: #000000;}
.odd {background-color: #cccccc; padding: 5px; color: #000000;}
.foot {background-color: #555555; padding: 5px; font-weight: bold;}
tr.even td {background-color: #999999; padding: 5px; color: #000000;}
tr.odd td {background-color: #cccccc; padding: 5px; color: #000000;}
Just edit the background-color and color attributes to suite.
If you need a great program for "capturing" color codes from your screen and mixing custom colors, check out
CPick.
Hope this helps.