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Robson Muniz
Robson Muniz

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Scroll Animation | JavaScript

Learn How to Make a Scroll Animation using CSS and JavaScript, step-by-step from scratch.
As you will notice in this tutorial: one block comes from the right and another one from the left!


<!DOCTYPE html>
<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">
  <title>Scroll Animation</title>
  <link rel="stylesheet" href="style.css">
  <script defer src="app.js"></script>
</head>

<body>
  <h1>Scroll to See 👀 the Animation</h1>

  <div class="box blue show">
    <h2>content</h2>
  </div>
  <div class="box red">
    <h2>content</h2>
  </div>
  <div class="box yellow">
    <h2>content</h2>
  </div>
  <div class="box green">
    <h2>content</h2>
  </div>
  <div class="box blue">
    <h2>content</h2>
  </div>
  <div class="box red">
    <h2>content</h2>
  </div>
  <div class="box yellow">
    <h2>content</h2>
  </div>
  <div class="box green">
    <h2>content</h2>
  </div>
  <div class="box blue">
    <h2>content</h2>
  </div>
  <div class="box red">
    <h2>content</h2>
  </div>
  <div class="box yellow">
    <h2>content</h2>
  </div>
  <div class="box green">
    <h2>content</h2>
  </div>

</body>

</html>
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CSS

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap');

* {
    box-sizing: border-box;
}

/*Color*/
.blue {
    --clr: #4285f4;
}
.red {
    --clr: #db4437;
}
.yellow {
    --clr: #f4b400;
}
.green {
    --clr: #0f9d58;
}

body {
    background-color: #636e72;
    font-family: "Roboto", sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0;
    overflow-x: hidden;
}

h1 {
    color: rgb(226, 226, 226);
    text-transform: uppercase;
    margin: 30px;
    text-shadow: 2px 2px 10px #000;
}

.box {
    background-color: var(--clr);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 400px;
    height: 200px;
    margin: 10px;
    border-radius: 20px;
    box-shadow: 2px 4px 5px rgba(0, 0, 0, 0.3);
    transform: translateX(400%);
    transition: transform 0.4s ease;
}

.box:nth-of-type(even) {
    transform: translateX(-400%);
}

.box.show {
    transform: translateX(0);
}

.box h2 {
    font-size: 45px;
    text-shadow: 2px 2px 3px #000;
}
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JavaScript

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');
        }
    });
}
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