css관련 도움 부탁 드립니다.

메뉴 가운데 정렬이 안되네요.

---------------------------------------------
<div module="Layout_category">
<!--@css(/css/module/layout/category.css)-->
<!--@js(/js/module/layout/category.js)-->
<h2>상품분류메뉴</h2>
<div class="postion" >
<ul>
<li class="pst10"><a href="/front/php/newpage.php?code=2" onMouseOver="img16.src='/SkinImg/me01_over.jpg'" onMouseOut="img16.src='/SkinImg/me01.jpg'" onfocus='this.blur()'>
<img id='img16' src='/SkinImg/me01.jpg' border=0; alt="All"></a></li>

<li class="pst1"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst2"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst3"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst4"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst5"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst6"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst7"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst8"><a href="/product/list.html{$param}">{$img_tag}</a></li>
<li class="pst9"><a href="/product/list.html{$param}">{$img_tag}</a></li>
</ul>
</div>
</div>
------------------------------------------------------------------------------
관련 css

.xans-layout-category { height:30px; margin:0 auto; }
.xans-layout-category h2 { display:none; }
.xans-layout-category .postion {z-index:1; text-align:center; margin:0 auto; }
.xans-layout-category ul {*zoom:1; border-top:1px #575757 solid; border-bottom:1px #575757 solid; height:40px; }
.xans-layout-category ul:after {content:""; display:block; clear:both; }

.xans-layout-category li { position:relative; float:left; padding:0 0px; text-align:center; }
.xans-layout-category li a { display:block; text-align:center; color:#839ca0; font-weight:bold; font-family:Lucida Sans; }
.xans-layout-category li a:hover { }
.xans-layout-category li img { position:relative; float:left; padding:8px 0px 0px; text-align:center; }
.xans-layout-category li.on > a { }
.xans-layout-category li.on { }

.xans-layout-category .sub-category { position:absolute; left:0; top:42px; display:block; width:500px; }
.xans-layout-category .sub-category ul { margin:0 0 10px; }
.xans-layout-category .sub-category a { float:left; padding:0 0 0 13px; color:#828b90; font-style:normal; }
.xans-layout-category .sub-category a:hover { color:#828b900; }
.xans-layout-category .sub-category li { display:inline; float:none; width:auto; line-height:32px !important; padding:0px 5px 0; }
.xans-layout-category .pst1 .sub-category { left:40px; }
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