JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main_border_vertical"> </div>

CSS

html{height:100%;}
body{height:100%;margin:0;}

 .main_border_vertical {
 height: 100%;
 width: 3px;
 background: red;
 border: none;
 margin-left: 100px;
 }