JSFiddle - React, Tailwind, and code Playground

HTML

<span class="buyinfo">buy</span>

<br />
<span id="confirmbox">confirmed</span>

JavaScript

$(document).ready(function() {
    $(".buyinfo")
    .click(AddToCart)
    .mouseout(popUpVanish);
    $('#confirmbox').hide();
});

var shoppingcart = {};

function AddToCart() {
    $('#confirmbox').show('normal');
}

function popUpVanish() {
    $('#confirmbox').delay(1000).fadeOut() ;
}