.info_nav li{ float: left;}
.info_nav{width:431px; margin:auto}
.info_nav li:nth-child(1) a{ margin-left:0px}
.info_nav li a{ height: 50px; line-height: 50px; color: #555555; font-size: 14px; margin-left: 25px; display: block;}
.info_nav li a:hover{ color: #286EFA; border-bottom: 2px solid #286EFA; height: 50px;}
.info{ width: 1200px; margin: auto; }
.hbox{height:50px;width:100%; border-bottom: 1px solid #f0f0f0; line-height: 50px; background: #fff;}
.info_nav li .aactive{color: #286EFA; border-bottom: 2px solid #286EFA; height: 50px;}