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HTML 

              
                <!-- カードセクション -->
<div class="Card">
  <div class="Card-Item">カード１</div>
  <div class="Card-Item">カード２</div>
  <div class="Card-Item">カード３</div>
</div>
<!-- モーダルとスライドショー -->
<div class="ModalLayer">
  <div class="ModalLayer-Mask"></div>
  <div class="ModalLayer-Inner">
    <div class="ModalSection">
      <div class="Modal">
        <div class="Modal-Inner">
          <!-- Swiper -->
          <div class="swiper-container Modal-Inner-Card">
            <div class="swiper-wrapper Modal-Inner-Card-Wrapper">
              <!-- item -->
              <div class="swiper-slide Modal-Inner-Card-Wrapper-Slide">
                <div class="Modal-Inner-Card-Wrapper-Slide-Item">
                  <div class="Modal-Inner-Card-Wrapper-Slide-Item-Box">
                    <p class="Modal-Inner-Card-Wrapper-Slide-Item-Box-Text">カード１の内容</p>
                  </div>
                </div>
              </div>
              <!-- item -->
              <div class="swiper-slide Modal-Inner-Card-Wrapper-Slide">
                <div class="Modal-Inner-Card-Wrapper-Slide-Item">
                  <div class="Modal-Inner-Card-Wrapper-Slide-Item-Box">
                    <p class="Modal-Inner-Card-Wrapper-Slide-Item-Box-Text">カード２の内容</p>
                  </div>
                </div>
              </div>
              <!-- item -->
              <div class="swiper-slide Modal-Inner-Card-Wrapper-Slide">
                <div class="Modal-Inner-Card-Wrapper-Slide-Item">
                  <div class="Modal-Inner-Card-Wrapper-Slide-Item-Box">
                    <p class="Modal-Inner-Card-Wrapper-Slide-Item-Box-Text">カード３の内容</p>
                  </div>
                </div>
              </div>
            </div>
          </div>
          <div class="swiper-button-prev"></div>
          <div class="swiper-button-next"></div>
          <div class="Modal-Inner-Btn JS_Click_CloseModal_Trigger">
            ☓
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                /* ---------------------------- */
/* --- カードセクション --- */
/* ---------------------------- */
.Card
  margin-top 24px
  width: 100%
  display: flex
  flex-wrap: wrap
  &-Item
    width: calc((100% - 56px) / 3)
    background: #eee;
    cursor: pointer
    &:not(:nth-child(3n-2))
      margin-left: 28px
/* ---------------------------- */
/* --- ModalSection --- */
/* ---------------------------- */
.ModalLayer
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  transition: opacity 0.65s;
  pointer-events: none;
  opacity: 0;
  z-index: 10000;
.ModalLayer.isShow
  transition: opacity 0.65s;
  pointer-events: auto;
  opacity: 1;
.ModalLayer-Mask
  position: absolute;
  background: rgba(0,0,0,0.5);
  width: 100%;
  height: 100vh;
.ModalLayer-Inner
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  max-width: 600px;
  transform: translate(-50%, -50%);
 // Swiper部分
 .Modal
  &-Inner
    &-Btn
      position: absolute;
      top: -35px
      right: -35px
      width: 70px
      color: #fff
      z-index: 10
      cursor: pointer
    &-Card
      width 100%
      &-Wrapper
        display: flex;
        &-Slide
          width 100%!important
          height: auto
          &-Item
            padding-top: 50px
            padding-bottom: 50px
            width 100%
            height: 100%
            background: #059bcc
            &-Box
              position: relative
              margin-left: auto;
              margin-right: auto;
              width: 78.37%
              &-Text
                color: #fff
!

JS 

              
                $(function(){

  var swiper = new Swiper('.swiper-container', {
    loop: true,
    slidesPerView: 'auto',
    centeredSlides: true,
    navigation: {
      nextEl: '.swiper-button-next',
      prevEl: '.swiper-button-prev',
    }
  });

  // モーダル開く
  $('.Card-Item').on('click', function(){
    var index = $(this).index();//クリックした要素のインデックスを取得
    swiper.slideTo(index);//指定のスライドを呼び出し
    $('.ModalLayer').addClass('isShow');
  });
  $('.ModalLayer-Mask').on('click', function(){
    $('.ModalLayer').removeClass('isShow');
  });
  $('.JS_Click_CloseModal_Trigger').on('click', function(){
    $('.ModalLayer').removeClass('isShow');
  });

});
!
999px

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