JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="sub">sub content</div>
</div>

CSS

.parent{
  height: 250px;
  border: 1px solid;
  display: flex;
  align-items: center;
  
}

.sub {
  height: 80px;
  width:100%;
  border: 1px solid red;
}