.daohang>ul>li{position: relative;}
.erji{
    position: absolute;
    top: 100%;
    width: 160px;
    z-index: 9999;
    overflow: hidden;
    line-height: normal;
    box-shadow: 0 5px 5px rgba(0, 0, 0, .1);
    transform: scaleY(0);
    transition: all 0.3s;
    transform-origin: top center;
    background: #ffffff;}
.erji::before{
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 10px;
    bottom: 0;
    z-index: 8;}
.erji ul{
overflow: hidden;
    position: relative;
    z-index: 9;}
.erji ul li a{
    display: block;
    font-size: 14px;
    color: #333333;
    line-height: 47px;
    white-space: nowrap;
    text-align: center;}
.daohang>li:hover .erji{
    display: block;
    transform: scaleY(1);}
.erji ul li a:hover {
    color: #fff;
    position: relative;
    background: #890207;}