JSFiddle - React, Tailwind, and code Playground

HTML

<div class="ptest">
        <div class="ptest-inner">
        </div>
	</div>

CSS

.ptest {
  width: 200px;
  position: relative;
  height: 0;
  padding-bottom: 60%;
}
.ptest-inner {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #333;
}