JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="col"></div>
  <div class="col"></div>
  <div class="col"></div>
</div>

CSS

.container {
  width: 100%;
  height: 1000px;
}

.col {
  display: inline-block;
  background: #333;
  width: 24%;
  height: 300px;
}

@media (max-width: 500px) {
  .col {
    display: block;
    background: #333;
    width: 100%;
    height: 200px;
    margin: 2px 0;
  }
}