JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main">
 <div class="border">
 
 </div>
</div>

CSS

.main {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #f2f2f2;
  height: 100vh;
}

.border {
  width: 100%;
  height: 3px;
  background: #fff;
  box-shadow: 0 3px 6px rgba(0,0,0,0.2)
}