JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outer">
  <div class="inner"></div>
</div>

CSS

.outer
{
  width: 50%;
  height: 200px;
  position: relative;
  border: 1px solid red;
}

.inner
{
  width: 100%;
  position: absolute;
  height: 100%;
  border: 1px solid blue;
}