/* 导航 */
.dahanbg{      width: 100%;  border-bottom: 3px solid #3e4f6d;display: inline-flex;flex-wrap:wrap;justify-content: space-between;}
#yj_nav{line-height: 67px;text-align: center; position: relative;}
#yj_nav>a{color: #4a4a4a;font-size: 22px;font-weight: bold;}
#yj_nav>a:hover{color: #9b0000;}
#yj_nav>a.on{color: #9b0000;}
#yj_nav ul{position: absolute;
    width: 300px;
    box-sizing: border-box;
    padding: 20px 25px;
    border-top: 5px solid #9b0000;
    background-color: #1b1b1b;
    z-index: 999;
    display: none;
    top: 67px;}
#yj_nav ul li{text-align:left;    line-height: 45px;}    
#yj_nav ul li a{color:#fff;display:block;text-align:left;}
#yj_nav ul li:hover a{color: #9b0000;}
#yj_nav:hover ul{display:block;}