JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <p>世界，你好！</p>
</div>

CSS

body{
    margin:0;
    padding:0;
    
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    position: absolute;
    align-items: center;
    justify-content: center;
}
p{
  margin: 0;
  padding: 0;
}
.container{
    padding: 1em;
    background: #3CC;
}