JSFiddle - React, Tailwind, and code Playground

by Abdul Ahmad

HTML

<div>
  <h2>
    bla bla bla
  </h2>
  <div class='border-bottom'>
  
  </div>
</div>

CSS

.border-bottom {
  width: 100%;
  height: 10px;
  background-color: red;
  margin-top: -30px;
}