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HTML

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://dl.dropbox.com/s/0z920nydj51coo7/reset3.css?dl=0">
  <!--==============スライダープラグイン「slick」のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css">
</head>

<body>
  <ul class="slider">
    <li><img src="https://assets.codepen.io/6329135/img_01.jpg" alt=""></li>
    <li><img src="https://assets.codepen.io/6329135/img_02.jpg" alt=""></li>
    <li><img src="https://assets.codepen.io/6329135/img_03.jpg" alt=""></li>
    <li><img src="https://assets.codepen.io/6329135/img_04.jpg" alt=""></li>
    <li><img src="https://assets.codepen.io/6329135/img_05.jpg" alt=""></li>
    <li><img src="https://assets.codepen.io/6329135/img_06.jpg" alt=""></li>
    <!--/slider-->
  </ul>
  <p>使用したライブラリ:<a href="https://kenwheeler.github.io/slick/" target="_blank">https://kenwheeler.github.io/slick/</a></p>

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js"></script>
</body>
              
            
!

CSS

              
                @charset "utf-8";

/*==================================================
スライダーのためのcss
===================================*/
.slider {
  /*横幅94%で左右に余白を持たせて中央寄せ*/
  width: 94%;
  margin: 5% auto;
}

.slider img {
  width: 100%; /*スライダー内の画像を横幅100%に*/
  height: auto;
}

/*slickのJSで書かれるタグ内、スライド左右の余白調整*/

.slider .slick-slide {
  margin: 0 10px;
}

/*矢印の設定*/

/*戻る、次へ矢印の位置*/
.slick-prev,
.slick-next {
  position: absolute; /*絶対配置にする*/
  top: 42%;
  cursor: pointer; /*マウスカーソルを指マークに*/
  outline: none; /*クリックをしたら出てくる枠線を消す*/
  border-top: 2px solid #666; /*矢印の色*/
  border-right: 2px solid #666; /*矢印の色*/
  height: 15px;
  width: 15px;
}

.slick-prev {
  /*戻る矢印の位置と形状*/
  left: -1.5%;
  transform: rotate(-135deg);
}

.slick-next {
  /*次へ矢印の位置と形状*/
  right: -1.5%;
  transform: rotate(45deg);
}

/*ドットナビゲーションの設定*/

.slick-dots {
  text-align: center;
  margin: 20px 0 0 0;
}

.slick-dots li {
  display: inline-block;
  margin: 0 5px;
}

.slick-dots button {
  color: transparent;
  outline: none;
  width: 8px; /*ドットボタンのサイズ*/
  height: 8px; /*ドットボタンのサイズ*/
  display: block;
  border-radius: 50%;
  background: #ccc; /*ドットボタンの色*/
}

.slick-dots .slick-active button {
  background: #333; /*ドットボタンの現在地表示の色*/
}

/*========= レイアウトのためのCSS ===============*/

body {
  background: #eee;
}

h2,
p {
  text-align: center;
  padding: 20px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: #333;
}

a:hover,
a:active {
  text-decoration: none;
}

              
            
!

JS

              
                $(".slider").slick({
  autoplay: true, //自動的に動き出すか。初期値はfalse。
  infinite: true, //スライドをループさせるかどうか。初期値はtrue。
  slidesToShow: 3, //スライドを画面に3枚見せる
  slidesToScroll: 1, //1回のスクロールで1枚の写真を移動して見せる
  prevArrow: '<div class="slick-prev"></div>', //矢印部分PreviewのHTMLを変更
  nextArrow: '<div class="slick-next"></div>', //矢印部分NextのHTMLを変更
  dots: true, //下部ドットナビゲーションの表示
  responsive: [
    {
      breakpoint: 769, //モニターの横幅が769px以下の見せ方
      settings: {
        slidesToShow: 2, //スライドを画面に2枚見せる
        slidesToScroll: 1 //1回のスクロールで1枚の写真を移動して見せる
      }
    },
    {
      breakpoint: 426, //モニターの横幅が426px以下の見せ方
      settings: {
        slidesToShow: 1, //スライドを画面に1枚見せる
        slidesToScroll: 1 //1回のスクロールで1枚の写真を移動して見せる
      }
    }
  ]
});

              
            
!
999px

Console