おぼえがき

                  
.swiper__content {
  position: relative;
  padding: 0;
  width: min(100%, 700px);
  margin: 0 auto 50px;
}
.swiper {
  display: flex;
}
.swiper-slide img {
  width: 100%;
  height: auto;
}
.swiper-thumb {
  margin-top: 5px;
  overflow: hidden;
}
.swiper-thumb .swiper-slide {
  width: calc(100% / 4);
}
.swiper-thumb .swiper-slide {
  opacity: .5;
  transition: opacity .5s ease;
  cursor: pointer;
}
.swiper-thumb .swiper-slide.swiper-slide-thumb-active {
  opacity: 1;
}
                  
                

                  
    const swiper = new Swiper(".swiper", {
      loop: true,
      // ページネーション
      pagination: {
        el: ".swiper-pagination",
        clickable: true, //ページネーションのクリックを有効にする
      },
      // 矢印
      navigation: {
        nextEl: ".swiper-button-next",
        prevEl: ".swiper-button-prev",
      }
    });