Hey,
Using Firebug, I can see that this code in style1.css (line 257) controls the active tabs:
.frontpagetabs .transformed_tab.fpactive_tab, .more-link {
background: url("../images/skin1/button.png") repeat-x scroll -37px -105px #FFFFFF;
border: 1px solid #CCCCCC;
color: #777777;
text-shadow: 1px 1px 1px #FFFFFF;
}
and this code in style1.css (line 251) controls the inactive tabs:
.frontpagetabs .transformed_tab {
background: none repeat scroll 0 0 #F8F8F8;
border: 1px solid #EEEEEE;
color: #888888;
}
along with this default code in style.css (line 685):
.frontpagetabs .transformed_tab, .more-link {
border-radius: 15px 15px 15px 15px;
cursor: pointer;
display: block;
float: left;
font-size: 12px;
line-height: 26px;
margin: 0 5px 10px 0;
padding: 0 13px;
position: relative;
top: -20px;
}
Hope this helps!
James