.z1{margin-top:20px;width:377px;height:43px;background:url(https://lxy.aust.edu.cn/skin/images/top_z.png);display:block;float:left;}
.header_main .tel{margin-top: 21px;}
.h_nav a:nth-child(3) {
    background: 0 0;}
.nav_main .nav li a.aLink {
    width: auto;
    margin: auto 1.02em;}
.footer{padding:0px;}