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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://assets.codepen.io/6329135/reset.css">
</head>

<body>
  <header id="header">
    <h1>Scroll me</h1>
    <div class="scrolldown"><span>Scroll</span></div>
  </header>
  <div id="container">
    <p>このエリアがスクロールすると上にかぶさります</p>
    <!--/container-->
  </div>
</body>
              
            
!

CSS

              
                @charset "utf-8";

/*========= 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: 1%;
  right: 50%;
  /*矢印の動き1秒かけて永遠にループ*/
  animation: arrowmove 1s ease-in-out infinite;
}

/*下からの距離が変化して全体が下→上→下に動く*/
@keyframes arrowmove {
  0% {
    bottom: 2%;
  }
  50% {
    bottom: 5%;
  }
  100% {
    bottom: 2%;
  }
}

/*Scrollテキストの描写*/
.scrolldown span {
  /*描画位置*/
  position: absolute;
  left: -20px;
  bottom: 10px;
  /*テキストの形状*/
  color: #eee;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  /*縦書き設定*/
  -ms-writing-mode: tb-rl;
  -webkit-writing-mode: vertical-rl;
  writing-mode: vertical-rl;
}

/* 矢印の描写 */
.scrolldown:before {
  content: "";
  /*描画位置*/
  position: absolute;
  bottom: 0;
  right: -6px;
  /*矢印の形状*/
  width: 1px;
  height: 20px;
  background: #eee;
  transform: skewX(-31deg);
}

.scrolldown:after {
  content: "";
  /*描画位置*/
  position: absolute;
  bottom: 0;
  right: 0;
  /*矢印の形状*/
  width: 1px;
  height: 50px;
  background: #eee;
}

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

h1 {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
  color: #eee;
  text-shadow: 0 0 15px #bbb;
  text-align: center;
}

#header {
  width: 100%;
  height: 100vh;
  position: relative;
}

#header:before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100vh;
  /*背景画像設定*/
  background: url("https://assets.codepen.io/6329135/img_05.jpg") no-repeat
    center;
  background-size: cover;
  filter: blur(1px) brightness(0.7);
}

#container {
  position: relative;
  z-index: 1;
  background: #eee;
  padding: 600px 0;
  text-align: center;
}

              
            
!

JS

              
                
              
            
!
999px

Console