<div class="swiper-container mySwiper1">
      <div class="swiper-wrapper">
        <div class="swiper-slide">Slide 1</div>
        <div class="swiper-slide">Slide 2</div>
        <div class="swiper-slide">Slide 3</div>
        <div class="swiper-slide">Slide 4</div>
        <div class="swiper-slide">Slide 5</div>
        <div class="swiper-slide">Slide 6</div>
        <div class="swiper-slide">Slide 7</div>
        <div class="swiper-slide">Slide 8</div>
        <div class="swiper-slide">Slide 9</div>
      </div>
    </div>

<div class="swiper-container mySwiper2">
      <div class="swiper-wrapper">
        <div class="swiper-slide">Slide 1</div>
        <div class="swiper-slide">Slide 2</div>
        <div class="swiper-slide">Slide 3</div>
        <div class="swiper-slide">Slide 4</div>
        <div class="swiper-slide">Slide 5</div>
        <div class="swiper-slide">Slide 6</div>
        <div class="swiper-slide">Slide 7</div>
        <div class="swiper-slide">Slide 8</div>
        <div class="swiper-slide">Slide 9</div>
      </div>
    </div>

<div class="swiper-container mySwiper3">
      <div class="swiper-wrapper">
        <div class="swiper-slide">Slide 1</div>
        <div class="swiper-slide">Slide 2</div>
        <div class="swiper-slide">Slide 3</div>
        <div class="swiper-slide">Slide 4</div>
        <div class="swiper-slide">Slide 5</div>
        <div class="swiper-slide">Slide 6</div>
        <div class="swiper-slide">Slide 7</div>
        <div class="swiper-slide">Slide 8</div>
        <div class="swiper-slide">Slide 9</div>
      </div>
    </div>

html,
      body {
        position: relative;
        height: 100%;
      }

      body {
        background: #eee;
        font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
        font-size: 14px;
        color: #000;
        margin: 0;
        padding: 0;
      }

      .swiper-container {
        width: 100%;
        height: 100%;
      }

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

        /* Center slide text vertically */
        display: -webkit-box;
        display: -ms-flexbox;
        display: -webkit-flex;
        display: flex;
        -webkit-box-pack: center;
        -ms-flex-pack: center;
        -webkit-justify-content: center;
        justify-content: center;
        -webkit-box-align: center;
        -ms-flex-align: center;
        -webkit-align-items: center;
        align-items: center;
      }

      .swiper-slide img {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: cover;
      }

const swiper1 = new Swiper(".mySwiper1", {});
const swiper2 = new Swiper(".mySwiper2", {});
const swiper3 = new Swiper(".mySwiper3", {});

const swipeAllSliders = (index) => {
  swiper1.slideTo(index);
  swiper2.slideTo(index);
  swiper3.slideTo(index);
}

swiper1.on('slideChange', () => swipeAllSliders(swiper1.activeIndex));
swiper2.on('slideChange', () => swipeAllSliders(swiper2.activeIndex));
swiper3.on('slideChange', () => swipeAllSliders(swiper3.activeIndex));