JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    height:2000px;
    margin:1000px 0 0 0;
    background:blue;
}

JavaScript

$(document).on("scroll", function (event) {
    var alto_total = $(this).scrollTop();
    var loader_business = $('div').offset();
    console.log(alto_total + " == " + loader_business.top);
    if (alto_total >= loader_business.top) {
        alert('tomalo');
       
    }
});