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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>

  <div id="wrapper">
    <div id="fixed-area">
      <!--左固定エリア-->
      <header>
        <h1>WEB先案内</h1>
      </header>
      <!--/fixed-area-->
      <div class="scrolldown"><span>Scroll</span></div>
    </div>

    <div id="container">
      <!--右エリア-->
      <section>
        <div class="area">
          <h2>Area 1</h2>
          <p>テキストが入ります。</p>
        </div>
        <!--/area1-->

      </section>

      <section>
        <div class="area">
          <h2>Area 2</h2>
          <p>テキストが入ります。</p>
        </div>
        <!--/area2-->
      </section>
      <section>
        <div class="area">
          <h2>Area 3</h2>
          <p>テキストが入ります。</p>
        </div>
        <!--/area3-->
      </section>
      <footer><small>&copy; separate corporation.</small></footer>
      <!--/container-->
    </div>
    <!--/wrapper-->
  </div>

  <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";

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

h1,
h2 {
  font-size: 2rem;
}

h2,
#container p,
small {
  margin: 0 0 30px 0;
}

small {
  display: block;
  text-align: center;
}
/*========= 左固定レイアウトのためのCSS ===============*/

/*左と右を囲う全体のエリア*/
#wrapper {
  position: relative; /*position stickyの基点にするため relativeをかける*/
  display: flex; /*左エリア、右エリア横並び指定*/
  flex-wrap: wrap; /*ボックスの折り返し可*/
}

/*左エリア*/
#fixed-area {
  /*左固定記述*/
  position: -webkit-sticky; /*Safari用*/
  position: sticky;
  top: 0;
  /*横半分50% 縦を100vhにする*/
  width: 50%;
  height: 100vh;
  /*装飾のためのCSS*/
  display: flex;
  justify-content: center;
  align-items: center;
  background: url("https://assets.codepen.io/6329135/nail1.jpg") no-repeat
    center;
  background-size: cover;
  color: #fff;
}

/*========= 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: 3;
  /*描画位置*/
  position: absolute;
  left: -15px;
  bottom: 45px;
  /*テキストの形状*/
  color: #fff;
  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: 3;
  content: "";
  /*描画位置*/
  position: absolute;
  top: 10px;
  left: 17px;
  /*線の形状*/
  width: 1px;
  height: 15px;
  background: #fff;
  /*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: 3;
  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 #fff;
}

/*マウスの中の丸の描写*/
.scrolldown:after {
  z-index: 3;
  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 #fff;
}

/*右エリア*/
#container {
  /*横半分50%にする*/
  width: 50%;
}
/*右各セクション 装飾のためのCSS*/
section {
  min-height: 100vh;
  padding: 30px;
}

section:nth-of-type(2n) {
  /*装飾のためのCSS*/
  background-image: radial-gradient(
    circle 321px at 8.3% 75.7%,
    rgba(209, 247, 241, 0.5) 0%,
    rgba(249, 213, 213, 0.5) 81%
  );
}
/*===========768px以下の見え方=============*/

@media screen and (max-width: 768px) {
  #wrapper {
    display: block; /*display:flex;を解除*/
  }
  section {
    min-height: auto; /*縦を100vh⇒解除*/
  }

  #fixed-area {
    position: relative !important; /*position stickyを解除*/
    width: 100%; /*横幅を100%にして1列に見せる*/
    height: 40vh; /*縦幅を100vh⇒40vh ※任意の高さに設定可能*/
  }

  #container {
    width: 100%; /*横幅を100%にして1列に見せる*/
  }
}

              
            
!

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-area");
  if (windowWidth >= 768) {
    Stickyfill.add(elements);
  } else {
    Stickyfill.remove(elements);
  }
});

              
            
!
999px

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