JSFiddle - React, Tailwind, and code Playground

by mrnobody

HTML

<div class="cont">
  <div class="cont__inner"></div>
</div>

CSS

.cont {
  max-width: 700px;
  border: 1px black solid;
}

.cont__inner {
  height: 0;
  padding-top: calc(400 / 700 * 100%)
}