JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="content">
        Very long text or images or whatever you need
    </div>
    <div id="content">
        Very long text or images or whatever you need
    </div>
</div>

CSS

#container {
        overflow:   scroll;
        width:      200px;
    }
    #content {
        width:      1000px;
        height:     100px;
    }

JavaScript

var maxScroll = $("#content").width() - $("#container").width();
$("#content").append("<br>maxScroll: " + maxScroll + "px");