JSFiddle - React, Tailwind, and code Playground

HTML

<div class="customparentbox">
  <div class="custombox">
    <p>Sample text</p>
    <button>test</button>
  </div>
</div>

CSS

.custombox {
  text-align: center;
  padding: 10px;
  position: relative;
  top:10px;
  left:10px;
  border: 1px solid;
}

.customparentbox {
  width:100px;
  background: red;
  border:1px solid green;
}