<div class="mask">
  <div class="swiper-container">
    <div class="swiper-scrollbar"></div>
    <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 class="swiper-slide">Slide 10</div>
    </div>
  </div>
</div>
<div class="swiper-button-prev"></div>
<div class="swiper-button-next"></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;
  background: url(https://images.unsplash.com/photo-1613351432233-26b513106fb5?crop=entropy&cs=srgb&fm=jpg&ixid=MnwxNDU4OXwwfDF8cmFuZG9tfHx8fHx8fHx8MTYxNTUzOTYxMg&ixlib=rb-1.2.1&q=85);
  background-size: cover;
}
.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;
}

#result {
  position: absolute;
  left: 10px;
  top: 10px;
  font-size: 30px;
  z-index: 100;
}

.mask {
  width: 100%;
  height: 100%;
  -webkit-mask: linear-gradient(
    to right,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 1) 60%,
    rgba(0, 0, 0, 0) 100%
  );
}

var swiper = new Swiper(".swiper-container", {
  spaceBetween: 50,
  slidesPerView: 3,
  navigation: {
    nextEl: ".swiper-button-next",
    prevEl: ".swiper-button-prev"
  },
  pagination: {
    el: ".swiper-pagination"
  },
});