JSFiddle - React, Tailwind, and code Playground

HTML

<div style="display:none" id="popup">

CSS

div{
    height : 50px;
    background-color:blue;
}

JavaScript

$(document).ready(function() {
    if(localStorage.getItem('popState') != 'shown'){
        $("#popup").delay(2000).fadeIn();
        localStorage.setItem('popState','shown')
    }

});