pc에서는 정상 작동하는데 모바일에서는 탭 자체가 없네요..

왜 그런지 모르겠습니다.ㅜㅜ

<div id="sub_cont">

<? include ('../inc/leftmenu01.php'); ?>

<div class="cont" style="height:550px;">

<div class="stitle"><img src="<?=G5_URL?>/images/about/stitle07.gif" alt="찾아오시는길" /></div>

<div class="clear">  

<div id="cont_tab">

<div class="over"><a href="../about/about_07.php" class="tab">내용</a></div>

<div class="normal"><a href="../about/about_07_01.php" class="tab">내용</a></div>

</div>

 <div> 

css 부분

/*서브tab*/

#cont_tab {clear:both; width:100%; height:40px; border-bottom:solid 1px #444;}

#cont_tab .over {float:left; background:#000; margin:0 2px 0 0; padding:10px; 

border-radius:10px 10px 0 0;

 -moz-border-radius:10px 10px 0 0;

 -webkit-border-radius:10px 10px 0 0;

 border-radius:10px 10px 0 0;

}

#cont_tab .normal {float:left; background:#666; margin:0 2px 0 0; padding:10px;

border-radius:10px 10px 0 0;

 -moz-border-radius:10px 10px 0 0;

 -webkit-border-radius:10px 10px 0 0;

 border-radius:10px 10px 0 0;

}

a.tab:link, a.tab:visited {color:#fff;text-decoration:none}

a.tab:hover, a.tab:focus, a.tab:active {color:#fff;text-decoration:underline}

.hr_none {height:10px; clear:both;}

ul.tabs {

margin: 0;

padding: 0;

float: left;

list-style: none;

height: 32px; /*--Set height of tabs--*/

border-bottom: 1px solid #999;

border-left: 1px solid #999;

width: 100%;

}

ul.tabs li {

float: left;

margin: 0;

padding: 0;

height: 31px; /*--Subtract 1px from the height of the unordered list--*/

line-height: 31px; /*--Vertically aligns the text within the tab--*/

border: 1px solid #999;

border-left: none;

margin-bottom: -1px; /*--Pull the list item down 1px--*/

overflow: hidden;

position: relative;

background: #e0e0e0;

}

ul.tabs li a {

text-decoration: none;

color: #000;

display: block;

font-size: 1.2em;

padding: 0 20px;

outline: none;

}

ul.tabs li a:hover {

background: #ccc;

}

html ul.tabs li.active, html ul.tabs li.active a:hover  { /*--Makes sure that the active tab does not listen to the hover properties--*/

background: #fff;

border-bottom: 1px solid #fff; /*--Makes the active tab look like it's connected with its content--*/

}

.tab_content {

padding: 20px;

font-size: 1.2em;

}