<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css" integrity="sha512-iBBXm8fW90+nuLcSKlbmrPcLa0OT92xO1BIsZ+ywDWZCvqsWgccV3gFoRBv0z+8dLJgyAHIhR35VZc2oM/gI1w==" crossorigin="anonymous" referrerpolicy="no-referrer" />
  <link rel="stylesheet" href="./style.css">
  <title>Scroll Animation</title>
</head>

<body>
  <h1>Scroll to see the animation</h1>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>
  <div class="box">
    <h2>Content</h2>
  </div>

  <script src="script.js"></script>
</body>

</html>
@import url("https://fonts.googleapis.com/css?family=Ubuntu");

* {
  box-sizing: border-box;
}

body {
  background-color: #efedd6;
  font-family: "Ubuntu", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
  overflow-x: hidden;
}
h1 {
  margin: 10px;
}

.box {
  background-color: steelblue;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 400px;
  height: 200px;
  margin: 10px;
  border-radius: 10px;
  box-shadow: 2px 4px 5px rgba(0, 0, 0, 0.3);
  transform: translateX(200%);
  transition: transform 0.4s ease;
}

.box:nth-of-type(even) {
  transform: translateX(-200%);
}
.box.show {
  transform: translateX(0);
}

.box h2 {
  font-size: 45px;
}

const boxes = document.querySelectorAll(".box");

window.addEventListener("scroll", checkBoxes);

checkBoxes();

function checkBoxes() {
  const triggerBottom = (window.innerHeight / 5) * 4;

  boxes.forEach((box) => {
    const boxTop = box.getBoundingClientRect().top;

    if (boxTop < triggerBottom) {
      box.classList.add("show");
    } else {
      box.classList.remove("show");
    }
  });
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.