JSFiddle - React, Tailwind, and code Playground

HTML

<input class="myButton" type="button" value="Short"/><br/>
<input class="myButton" type="button" value="Medium Medium"/><br/>
<input class="myButton" type="button" value="Long Long Long Long"/><br/>

JavaScript

$('.myButton').width(
    Math.max.apply( 
        Math, 
        $('.myButton').map(function(){
            return $(this).outerWidth();
        }).get()
    )
);