JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container"></div>

CSS

* { margin:0;padding:0; }
#container {
    width:50px;
    position:absolute;
    height:400px;
    display:block;
    background: #ccc;
}

JavaScript

function setMargins() {
    width = $(window).width();
    containerWidth = $("#container").width();  
    leftMargin = (width-containerWidth)/2;    
    $("#container").css("marginLeft", leftMargin);    
}

$(document).ready(function() {
    setMargins();
    $(window).resize(function() {
        setMargins();    
    });
});