JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" onclick="javascript:change();" value="Click">
    <div id="mobilemenu">Menu</div>

JavaScript

document.getElementById("mobilemenu").style.display = "block";

function change() {
    var displayVal = document.getElementById("mobilemenu").style.display;
    if (displayVal == "block")
        document.getElementById("mobilemenu").style.display = "none";
    else if (displayVal == "none")
        document.getElementById("mobilemenu").style.display = "block";
}