#cty-box{
    position: relative; 
    margin: 24px auto;
    border: 1px solid #999;
    height: 1.28rem;
    line-height: 1.28rem;
    border-radius: 4px;
    padding: 0 .213333rem;
    font-size: .34rem;
    width: 9.6rem;
}
#cty-box .cty-selector{
    position:absolute; top:1.27rem; left:0; width: 9.6rem; background: #fff; z-index:9;
    border: 1px solid #ccc;
    height: 250px;
    overflow: auto;
    clear: both;
    display: none;
}
#cty-box .cty-selector li{
    padding:0 10px;
    line-height: 30px;
    cursor: default;
    font-size: 12px;
}
#cty-box .cty-selector li:hover{
    background: #f2f2f2;
}
#cty-box .cty-selector span {
    float: right;
    margin-bottom: 0px;
}
.down_img{
    float: right;
    margin-top: 0.3rem;
}
.down_img_active{
    transform: rotate(180deg);
}