JSFiddle - React, Tailwind, and code Playground

HTML

<button type="submit" name="submit" id="start" value="Submit">Start</button>
<button type="submit" name="submit" id="walkaway" value="Submit">Walk Away</button>

CSS

#walkaway {
    display: none;
}

JavaScript

$(document).ready(function () {
    $("#start").click(function () {
        $("#walkaway").fadeIn().delay(2000).fadeOut();
    });
});