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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 href="https://assets.codepen.io/6329135/reset04.css" rel="stylesheet">
</head>

<body>

  <header id="header">
    <h1>WEB先案内</h1>
  </header>
  <div class="scrolldown"><span>Scroll</span></div>
  <main id="container">
    <section class="fixed">
      <h2>Area 1</h2>
      <p>テキストが入ります。</p>
      <!--/area1-->

    </section>
    <section class="fixed">
      <h2>Area 2</h2>
      <!--/area2-->
    </section>
    <section class="fixed">
      <h2>Area 3</h2>
      <p>テキストが入ります。</p>

      <!--/area3-->
    </section>
    <section class="fixed">
      <h2>Area 4</h2>
      <!--/area4-->
    </section>
    <section class="fixed">
      <h2>Area 5</h2>

      <p>テキストが入ります。</p>
      <!--/area5-->
    </section>
    <!--/main-->
  </main>

  <footer id="footer">
    <small>&copy; copyright.</small>
  </footer>

  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/stickyfill/2.1.0/stickyfill.min.js"></script>

</body>
              
            
!

CSS

              
                @charset "utf-8";

/*========= 紙芝居風レイアウトのためのCSS ===============*/

section.fixed {
  position: -webkit-sticky; /*Safari*/
  position: sticky;
  top: 70px; /*Header高さ分で止まるようにする*/
  /*装飾のためのCSS*/
  background: #fff;
  padding: 100px 30px 170px 30px;
  min-height: 100vh;
}

section.fixed:nth-of-type(2n) {
  /*装飾のためのCSS*/
  color: #fff;
  text-align: center;
  padding: 300px 30px;
  min-height: auto;
}

section.fixed:last-of-type {
  padding: 170px 30px 100px 30px; /*最後のセクションだけ止まらないため、エリア内の情報が少ない時は、HEADER分の高さをpadding-topに追加して上部が見えるようにする*/
}

section.fixed:nth-of-type(2) {
  background: url("https://assets.codepen.io/6329135/nail2.jpg") no-repeat
    center;
  background-size: cover;
}

section.fixed:nth-of-type(4) {
  background: url("https://assets.codepen.io/6329135/nail3.jpg") no-repeat
    center;
  background-size: cover;
}

/*========= スクロールダウンのためのCSS ===============*/

/*スクロールダウン全体の場所*/
.scrolldown {
  /*描画位置※位置は適宜調整してください*/
  position: absolute;
  bottom: 10px;
  right: 50%;
  /*マウスの動き1.6秒かけて動く永遠にループ*/
  animation: mousemove 1.6s ease-in-out infinite;
}

/*下からの距離が変化して上から下に動く*/
@keyframes mousemove {
  0% {
    bottom: 10px;
  }
  50% {
    bottom: 5px;
  }
  100% {
    bottom: 10px;
  }
}

/*Scrollテキストの描写*/
.scrolldown span {
  z-index: 10;
  /*描画位置*/
  position: absolute;
  left: -15px;
  bottom: 45px;
  /*テキストの形状*/
  color: #333;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/*マウスの中の線描写 */
.scrolldown span::after {
  z-index: 10;
  content: "";
  /*描画位置*/
  position: absolute;
  top: 10px;
  left: 17px;
  /*線の形状*/
  width: 1px;
  height: 15px;
  background: #333;
  /*線の動き1.4秒かけて動く。永遠にループ*/
  animation: mousepathmove 1.4s linear infinite;
  opacity: 0;
}

/*上からの距離・不透明度・高さが変化して上から下に流れる*/
@keyframes mousepathmove {
  0% {
    height: 0;
    top: 10px;
    opacity: 0;
  }
  50% {
    height: 15px;
    opacity: 1;
  }
  100% {
    height: 0;
    top: 30px;
    opacity: 0;
  }
}

/*マウスの描写 */
.scrolldown:before {
  z-index: 10;
  content: "";
  /*描画位置*/
  position: absolute;
  bottom: 0;
  left: -10px;
  /*マウスの形状*/
  width: 25px;
  height: 37px;
  border-radius: 10px;
  border: 1px solid #333;
}

/*マウスの中の丸の描写*/
.scrolldown:after {
  z-index: 10;
  content: "";
  /*描画位置*/
  position: absolute;
  bottom: 26px;
  left: 0;
  /*丸の形状*/
  width: 5px;
  height: 5px;
  border-radius: 50%;
  border: 1px solid #333;
}

/*===========タブレット以下の見え方=============*/

@media screen and (max-width: 768px) {
  section.fixed,
  section.fixed:last-of-type {
    position: relative !important; /*sticky解除*/
    top: 0; /*70px⇒0pxに戻す*/
    min-height: auto;
    padding: 30px;
  }

  section.fixed:first-of-type {
    padding: 100px 30px 30px 30px; /*最初の要素は上部にHeaderの高さ以上の余白をとる*/
  }

  section.fixed:nth-of-type(2n) {
    padding: 100px 30px;
  }
}

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

h1 {
  font-size: 1.2rem;
}

#container h2 {
  font-size: 1.2rem;
}

#container p {
  margin-top: 20px;
}

small {
  background: #333;
  color: #fff;
  display: block;
  text-align: center;
  padding: 20px;
}

#header {
  position: fixed; /*Header固定*/
  top: 0;
  height: 70px; /*高さ指定*/
  z-index: 2;
  width: 100%;
  /*装飾のためのCSS*/
  background: #333;
  color: #fff;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
}

#container {
  position: relative;
  z-index: 1; /*header とfooterを手前にするため数字を小さく*/
}

#footer {
  position: relative;
  z-index: 2;
}

              
            
!

JS

              
                /* 768px以上で、position: sticky;に対応していないブラウザは『1カラム』表示する */
$(window).on("load resize", function () {
  var windowWidth = window.innerWidth;
  var elements = $(".fixed");
  if (windowWidth >= 768) {
    Stickyfill.add(elements);
  } else {
    Stickyfill.remove(elements);
  }
});

              
            
!
999px

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