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HTML

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About the <head>

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Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <body>
  <div class="content">
    <ul id="slider">
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (1).jpg" alt=""></li>
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (2).jpg" alt=""></li>
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (3).jpg" alt=""></li>
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (4).jpg" alt=""></li>
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (5).jpg" alt=""></li>
      <li><img src="https://spica-weblog.github.io/codepen-lesson/img/sample_img (6).jpg" alt=""></li>
    </ul>
  </div>
</body>
!

CSS 

              
                img {
  max-width: 100%;
}
ul {
  list-style: none;
}
#slider {
  width: 100%;
  margin: 0 auto;
  position: relative;
}

/* [共通]スライダー矢印 */
#slider .prev,
#slider .next {
  width: 40px;
  height: 40px;
  background-color: #000;
  cursor: pointer;
  opacity: 0.7;
  position: absolute;
  top: 45%;
  transition: 0.6s;
  z-index: 100;
}
#slider .prev:hover,
#slider .next:hover {
  opacity: 0.5;
}
#slider .prev::before,
#slider .prev::after,
#slider .next::before,
#slider .next::after {
  content: "";
  display: block;
  width: 14px;
  height: 2px;
  background-color: #fff;
  position: absolute;
}

/* [左]スライダー矢印 */
#slider .prev {
  left: 20;
}
#slider .prev::before,
#slider .prev::after {
  left: 12px;
}
#slider .prev:before {
  top: 37%;
  transform: rotate(-45deg);
}
#slider .prev:after {
  bottom: 37%;
  transform: rotate(45deg);
}

/* [右]スライダー矢印 */
#slider .next {
  right: 0;
}
#slider .next::before,
#slider .next::after {
  right: 12px;
}
#slider .next:before {
  top: 37%;
  transform: rotate(45deg);
}
#slider .next:after {
  bottom: 37%;
  transform: rotate(-45deg);
}

/* レスポンシブ */
@media screen and (max-width: 900px) {
  #slider .prev,
  #slider .next {
    top: 40%;
  }
}
!

JS 

              
                $(document).ready(function(){
  $('#slider').slick({
    autoplay: true,                         // 自動再生オン
    autoplaySpeed: 5000,                    // スライドを5秒で切り替え
    arrows: true,                           // 左右の矢印を表示
    dots: true,                             // ドット（ページ送り）を表示
    slidesToShow: 1,                        // スライドを1枚表示
    centerMode: true,                       // 両端が見切れて表示される
    centerPadding: '18%',                   // 見切れたコンテンツの幅の設定
    prevArrow:'<div class="prev"></div>',   // 左矢印のHTMLを変更する
    nextArrow:'<div class="next"></div>',   // 右矢印のHTMLを変更する
    responsive: [              // レスポンシブの設定
      {
        breakpoint: 900,       // 900px以下の場合に適用
        settings: {
          centerMode: false    // センターモードをオフにする
        }
      }
    ]
  });
});
!
999px

Console