.banner {
    width: 100%;
    height: 2.5rem;
    margin: 0 auto;
    overflow: hidden;
    clear: both;
    position: relative;
}
.item {
    width: 100%;
    position: relative;
    transition: background-color .2s ease;
}
.item img {
    width:100%;
    height:2.5rem;
}
.pagination {
    position: absolute;
    left: 0;
    text-align: center;
    bottom: .1rem;
    width: 100%;
}
.swiper-pagination-switch {
    display: inline-block;
    width: .1rem;
    height: .1rem;
    border-radius: 50%;
    margin: 0 .1rem;
    cursor: pointer;
    border: 1px solid #fff;
}
.swiper-active-switch {
    background: #fff;
}