JSFiddle - React, Tailwind, and code Playground

HTML

<div class="red-button">
    <span class="bg-fix"></span>
    <p>Progress Button</p>
</div>
<button class="click-me">Click Me</button>

CSS

.red-button {
    display: block;
    height: 40px;
    width: 250px;
    overflow: hidden;
    position: relative;
    background: red;
    padding: 0;
}
span.bg-fix {
    display: block;
    height: 100%;
    width: 0;
    position: absolute;
    z-index: 0
    top: 0;
    left: 0;
    background: blue;
    transition: width 10s ease-in-out;
}
p {
    font-family: sans-serif;
    white-space: no-warp;
    line-height: 40px;
    position: relative;
    z-index: 1
    width: 100%;
    text-align: center;
    color: #fff;
    margin: 0;
    padding: 0;
}

JavaScript

$("button.click-me").click(function () {
    $('span.bg-fix').css("width", "100%");
});