JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>Hello</li>
    <li>World</li>
    <li>This is fun</li>
</ul>

CSS

ul li:after {
    content: "";
    display: block;
    height: 1px;
    width: 40%;
    margin: 10px;
    background: #f00;
}