.pic-img {
    position: relative;
    padding-top: 122.5%;}
   .swiper {
      width: 100%;
      height: 100%;}

    .swiper-slide {
      text-align: center;
      font-size: 18px;
      background: #fff;}

    .swiper-slide img {
 display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 999;}