This is a CSS template, anything is adjustable.
The template uses the easy 960.gs grid system (fluid) with a 16 column base
If you want a fixed 3 column layout and you want to widen the left/right columns a little...
ability/skin/ability/customer/home_3_cols.tpl
Change...
Code:
<div class="grid_3 alpha">
{include file="customer/left_bar.tpl"}
</div>
<div class="grid_10">
<div id="center-main">
{include file="customer/content.tpl"}
</div>
</div>
<div class="grid_3 omega">
{include file="customer/right_bar.tpl"}
</div>
<div class="clearing"></div>
To...
Code:
<div class="grid_4 alpha">
{include file="customer/left_bar.tpl"}
</div>
<div class="grid_8">
<div id="center-main">
{include file="customer/content.tpl"}
</div>
</div>
<div class="grid_4 omega">
{include file="customer/right_bar.tpl"}
</div>
<div class="clearing"></div>