JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bar" data-value="60"></div>

CSS

.bar {
    position: relative;
    width: 250px;
    height: 50px;
    text-align: center;
    line-height: 50px;
    background: #003458;
    background: linear-gradient(to bottom, #005478 0%,#003747 100%);
    color: white;
}

.bar:before {
    position: absolute;
    display: block;
    top: 0;
    left: 0;
    bottom: 0;
    width: 60%;
    width: attr(data-value %, 0); /* currently not supported, so
                                     fall back to hard coded 60% */
    content: '';
    background: rgba(255, 255, 255, 0.1);
}

.bar:after {
    content: attr(data-value) "%";
}