<div class="container">
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
   <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
   <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
   <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
  <div class="row">
    <div class="box"></div>
    <div class="box"></div>
    <div class="box"></div>
  </div>
</div>
body {
  background-color: #757575;
}
.container {
  max-width: 400px;
  margin: auto;
}
.row {
  display: flex; 
}
.box {
  margin: 10px;
  width: 100px;
  height: 90vh;
  background-color: #79BD9A;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://unpkg.com/scrollreveal