JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="item"></div>
  <section class="item"></section>
  <section class="item"></section>
  <footer class="item"></footer>
</div>

CSS

.container {
  display: flex;
  flex-direction: column;
  width: 600px;
  background-color: blue;
  justify-content: center; /* Not centering content horizontally? */
}
.item {
  max-width: 500px;
  height: 100px;
  background-color: yellow;
  border: 2px solid red;
}