.nav {
    background: #A42821;
    height: 50px;
    margin: auto;
}

.nav_content {
    width: 1200px;
    height: 50px;
    margin: 0 auto;
}
.nav_content ul{
    width: 1200px;
    height: 50px;
    margin: auto;
}
.nav_content ul li {
    text-align: center;
    width: 16%;
    height: 50px;
    line-height: 49px;
    float: left;
    color: #EEEEEE;
}

.nav_content ul li a {
    font-size: 24px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #FFFFFF;
}

.nav_content ul .on {
    background-color: #e22015;
}