.drop-down{
    width: 100%;
    height: 100%;
    position: relative;
}   
/* 输入框 */
.drop-down-input{

}
.drop-down-input input{
    width: 100%;
}
/* 下拉列表 */
.drop-down-list{
    width: 100%;
    position: absolute;
    z-index: 100;
    display: none;
}
.drop-down.active .drop-down-list{
    display: block;
    animation: drop-down-show 0.3s linear 0s 1 normal forwards;
}
@keyframes drop-down-show {
    0%{opacity: 0;}
    100%{opacity: 1;}
}
.drop-down-list ul{
    max-height: 400px;
    overflow-y: auto;
}
.drop-down-list ul li{
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #eee;
    border: 1px solid #dcdcdc;
    cursor: pointer;
}
.drop-down-list ul li.hide{
    display: none;
}
.drop-down-list ul::-webkit-scrollbar-track {
    border-radius: 10px;
    background-color: #eee;
    overflow: hidden;
}
/*滚动条的宽度和圆角*/
.drop-down-list ul::-webkit-scrollbar
{
    width: 5px;
    border-radius: 10px;
    background-color: #fff;
}
/*滚动条颜色*/
.drop-down-list ul::-webkit-scrollbar-thumb
{
    border-radius: 9px;
    background-color: #9aadd4;
}
.drop-down-list ul li:hover{
    background: rgb(60, 60, 154);
    color: #fff;
}