JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div></div>
  <div></div>
  <div></div>
</div>

CSS

div#container {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* for better viewing */
body, html {
  margin: 0;
  height: 100%;
  box-sizing: border-box;
  padding: 10px;
  background-color: white;
}
div#container {
  background-color: #e9e9e9;
  height: 100%;
  width: 100%;
}
div#container > div {
  background-color: #57797f;
  width: 100px;
  height: 100px;
  margin: 10px;
}