JSFiddle - React, Tailwind, and code Playground

HTML

<div id="progress">
</div>

CSS

#progress {
    background: #333;
    border-radius: 13px;
    height: 20px;
    width: 300px;
    padding: 3px;
}

#progress:after {
    content: '';
    display: block;
    background: orange;
    width: 50%;
    height: 100%;
    border-radius: 9px;
}