JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
  margin: 30px auto;
  width: 300px;
  height: 300px;
  background: #43CCF4;
  opacity: 0.5;
  box-shadow: 10px -10px 0 rgba(67,204,244,.5);
}