<div class="wrap section1">
  <div class="container">
    <p>スクロールしてみよう!</p>
  </div>
</div>

<div class="wrap section2">
  <div class="container">
    <img class="lazyload" width="400" height="300" data-src="https://drive.google.com/uc?export=view&id=1gfZjLzG4BXU-ieu5Vb2K6ZMQ6GcMlU2e" alt="" data-expand="-20" />
  </div>
  <div class="container">
    <img data-src="https://drive.google.com/uc?export=view&id=172pIgbAQZlAWJ18GFLXM9MoWbbi8XfxU" alt="" class="lazyload" width="400" height="300" data-expand="-20" />
  </div>
  <div class="container">
    <img data-src="https://drive.google.com/uc?export=view&id=10YpX23wkcjRflfloUt7tqLeumpias42N" alt="" class="lazyload" width="400" height="300" data-expand="-20" />
  </div>
  <div class="container">
    <img data-src="https://drive.google.com/uc?export=view&id=10mqA1CfPi8N9_McRCe0bOGR_jUHzPEch" alt="" class="lazyload" width="400" height="300" data-expand="-20" />
  </div>
  <div class="container">
    <img data-src="https://drive.google.com/uc?export=view&id=1gfZjLzG4BXU-ieu5Vb2K6ZMQ6GcMlU2e" alt="" class="lazyload" width="400" height="300" data-expand="-20" />
  </div>
  <div class="container">
    <img data-src="https://drive.google.com/uc?export=view&id=10YpX23wkcjRflfloUt7tqLeumpias42N" alt="" class="lazyload" width="400" height="300" data-expand="-20" />
  </div>
</div>
html,
body {
  margin: 0;
  padding: 0;
}

* {
  box-sizing: border-box;
}

.wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px 20px;
}

.section1 {
  height: 100vh;
}
.section2 {
  height: 200vh;
}

.container {
  margin: 4rem 0;
  text-align: center;
}

.container p {
  font-size: 2rem;
}
.container img {
  width: 80%;
  height: auto;
  vertical-align: top;
  background-color: silver;
  opacity: 0; /* 読み込んだ瞬間は透明に */
}

/* lazyloadedになったらfadeアニメーションを実行 */
.container img.lazyloaded {
  animation: fade 1s forwards;
}

/* fadeアニメーション */
@keyframes fade {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/lazysizes/5.2.0/lazysizes.min.js