JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <div class="container">
    <div class="content">
      This div will be centered
    </div>
  </div>
</body>

CSS

html,
body {
    height: 100%;
    width: 100%;
}

.container {
    align-items: center;
    display: flex;
    justify-content: center;
    height: 100%;
    width: 100%;
}

.content {
    width: 440px;
}