JSFiddle - React, Tailwind, and code Playground

HTML

<div style="background: rgba(0,255,0,0.5);border: 1px solid;display: inline-block;">
  <div style="margin: 20% 0% 20% 20%;background: rgba(255,0,0,0.3);width:100px;height:100px;">测试测试</div>
</div>
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CSS

html,body{margin: 0;}