JSFiddle - React, Tailwind, and code Playground

HTML

<div class="barline">
    <div class="inner" style="margin-left:-40%;">60%</div>
</div>

CSS

.barline{width:150px;height:20px;border:1px solid #555;overflow:hidden;}
.barline .inner{background:blue;width:100%;color:#fff;text-align:right;}