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CSS

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JavaScript

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Babel includes JSX processing.

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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 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; /*スライド左右の余白調整*/
}

/*========= 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({
  arrows: false, //左右の矢印はなし
  autoplay: true, //自動的に動き出すか。初期値はfalse。
  autoplaySpeed: 0, //自動的に動き出す待ち時間。初期値は3000ですが今回の見せ方では0
  speed: 6900, //スライドのスピード。初期値は300。
  infinite: true, //スライドをループさせるかどうか。初期値はtrue。
  pauseOnHover: false, //オンマウスでスライドを一時停止させるかどうか。初期値はtrue。
  pauseOnFocus: false, //フォーカスした際にスライドを一時停止させるかどうか。初期値はtrue。
  cssEase: "linear", //動き方。初期値はeaseですが、スムースな動きで見せたいのでlinear
  slidesToShow: 3, //スライドを画面に4枚見せる
  slidesToScroll: 1, //1回のスライドで動かす要素数
  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
      }
    },
    {
      breakpoint: 426, //モニターの横幅が426px以下の見せ方
      settings: {
        slidesToShow: 1.5 //スライドを画面に1.5枚見せる
      }
    }
  ]
});
!
999px

Console