JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
</div>

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam eget ligula placerat, tincidunt risus nec, feugiat ipsum. Mauris mollis interdum urna, accumsan facilisis turpis laoreet ut. Ut egestas tortor eget nisi dictum, in venenatis diam sodales....</p>

CSS

body{
  height: 1000px;
  background: #ccc;
}

.box{
  position: fixed;
  top: 20px;
  left: 100px;

  height: 100px;
  width: 100px;
  background: red;
}

p{
  font-size: 20px;
  font-weight: 700;
  color: green;
}