JSFiddle - React, Tailwind, and code Playground

HTML

<span>test</span>
<div></div>

CSS

body{
  text-align: center;
}

span{
  background-color: #FFFF;
  z-index: 2;
}

div{
  border-top: 1px solid;
  position: absolute;
  width: 100%;
  margin-top: -8px;
  z-index: 1;
}