JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child">Child</div>
</div>

CSS

.parent {
  padding: 10px 25px 10px 10px;
  border: 1px solid #000;
}

.child {
  background: blue;
  width: 100%;
  color: #fff;
}