.header {border-bottom: 1px solid #183957;background-color: #0f2436;}
.nav a {color: #fff;}
.search {border-right: 1px solid #183957;border-left: 1px solid #183957;}
.sea_ipt {background-color: transparent}
.logo {background: url('../../img/logo_ab_2.png');background-size: 100% 100%;}
.kb-main {width: auto;padding: 30px;min-width: 1100px;max-width: 1600px;min-height: 500px;}
.header_cnt {width: 100%;max-width: 1660px;padding: 0 30px;-webkit-box-sizing: border-box;-moz-box-sizing: border-box;box-sizing: border-box;}