There are plenty of CSS alternatives for changing the look of the tabs, however, if you want a clean look then change the background every CSS in the TPP folder to transparent.
Then change the text color to match, or stand out from, your current CSS.
Example for alt_tpp_tabs6.css (line 49)
Change the entries in red.
Code:
.tabcontent {
-moz-background-clip:border;
-moz-background-inline-policy:continuous;
-moz-background-origin:padding;
background:white none repeat scroll 0 0;
border-bottom:1px solid;
clear:both;
color:black;
display:none;
float:left;
width:100%;
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