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                <div class="wrap">
  <div class="imgBox">
    <ul id="shohinslider">
      <li class="slide-item"><img data-lazy="" alt="画像1"></li>
      <li class="slide-item"><img data-lazy="" alt="画像2"></li>
      <li class="slide-item"><img data-lazy="" alt="画像3"></li>
    <ul id="thumbnail-list">
      <li class="thumbnail-item"><img src="" alt="画像1"></li>
      <li class="thumbnail-item"><img src="" alt="画像2"></li>
      <li class="thumbnail-item"><img src="" alt="画像3"></li>


  width: 50%
  display: flex
    width: calc(100% - 5em)
      width: 100%
    display: flex
    flex-direction: column
    margin: 0 auto
    width: 5em
    margin-bottom: 1em
    box-sizing: border-box
    position: relative
      width: 100%
      margin: 0 auto


  var slider = "#shohinslider"; // スライダー
  var thumbnailItem = "#thumbnail-list .thumbnail-item"; // サムネイル画像アイテム
  // サムネイル画像アイテムに data-index でindex番号を付与
   var index = $(thumbnailItem).index(this);
  // スライダー初期化後、カレントのサムネイル画像にクラス「thumbnail-current」を付ける
   var index = $(".slide-item.slick-slide.slick-current").attr("data-slick-index");

    autoplay: false,
    arrows: false,
    fade: true,
    infinite: false
    var index = $(this).attr("data-index");
  $(slider).on('beforeChange',function(event,slick, currentSlide,nextSlide){