body, ul, li{
    padding: 0;
    margin: 0;
}
li {
    list-style: none;
}
.main {
    width: 520px;
    height: 280px;
    border: 1px solid #000;
    margin: 80px auto;
    position: relative;
    overflow: hidden;
}

.main .pic{
    width: 1560px;
    position: absolute;
    transition: all ease 0.4s;
}
.main li {
    float: left;
}
.main img {
    width: 520px;
    height: 280px;
}
.yd {
    position: absolute;
    z-index: 2;
    left: 50%;
    margin-left: -43.5px;
    bottom: 12px;
}
.yd li {
    width: 20px;
    height: 20px;
    background: #fff;
    margin-right: 9px;
    border-radius: 100%;
}
.active {
    background: red !important;
}
.action {
    position: absolute;
    top: 50%;
    z-index: 3;
    width: 100%;
    margin-top: -26.5px;
}
.left {
    font-size: 38px;
    color: #fff;
    float: left;
    cursor: pointer;
}
.right {
    font-size: 38px;
    color: #fff;
    float: right;
    cursor: pointer;
}