.oka_tab{margin:0 auto}
.oka_tab li{display:block;float:left;border:1px solid #ddd;border-left:0}
.oka_tab li:first-child{border-left:1px solid #ddd;border-radius:3px 0 0 3px}
.oka_tab li:last-child{border-radius:0 3px 3px 0}
.oka_tab a{padding:8px 14px;display:block;text-shadow:1px 1px #fff;color:#888;background-color:#fafafa;background-image:linear-gradient(to bottom,#fff,#f5f5f5)}
.oka_tab a:hover{background-color:#eaeaea;background-image:linear-gradient(to bottom,#f5f5f5,#eaeaea)}
.oka_tab .active{background-color:#e5e5e5;background-image:linear-gradient(to bottom,#eaeaea,#e5e5e5);color:#555}
.oka_tab:after{display:block;content:'';height:0;visibility:hidden;clear:both}