JSFiddle - React, Tailwind, and code Playground

HTML

<div class='withborder'></div>
<br>
<div class='noborder'></div>

CSS

div{
    box-sizing:border-box;
    width:200px;
    height:20px;
    background:grey;
    border-right:solid black 20px;
}

.noborder{
    border:none;
}