JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box">

<hr class="line1">
<hr class="line2">
    
</div>

CSS

#box {
    width: 85%;
    margin: 0 auto;
}

.line1 {
  width: 100%;
  border: none;
  background-color: black;
  height: 0.5px;
}

.line2 {
  width: 100%;
  border: none;
  background-color: black;
  height: 0.5px;
}