JSFiddle - React, Tailwind, and code Playground

HTML

<div onclick="open()" class="open" id="open">
    <span onclick="close()" id="close()">X</span>
    Hi dude!
</div>

CSS

.open {
    display: none;
}

JavaScript

ok = document.getElementById("open");

function open(){
    ok.style.display = "block";
}

open();