underline
by Kim Ara
HTML
<div class="tab">
<ul>
<li class=""><a href="#">클래식</a></li>
<li class="active"><a href="#">프레쉬 라이트</a></li>
<li class=""><a href="#">프리미엄</a></li>
<li class=""><a href="#">아침메뉴</a></li>
</ul>
</div>
CSS
li{list-style: none;}
a{text-decoration: none;color: #333;}
/* .tab{text-align:center;}
.tab ul{overflow:hidden; display:inline-block;} */
.tab ul li{float:left; padding:0 10px;;}
.tab ul li a{display:inline-block;padding:20px 0 18px 0;position:relative;font-size:13px;color:#999999;font-weight:300;letter-spacing:-0.03em;}
.tab ul li a:after{content:'';position:absolute;left:50%;bottom:12px;height:2px;width:0;background-color:#009223;transition-duration:0.2s;}
.tab ul li.active a{font-weight:bold;color:#009223;}
.tab ul li.active a:after{left:0;width:100%;}
JavaScript
$('.tab ul li').click(function(){
$(this).addClass('active');
$(this).siblings().removeClass('active');
});