JSFiddle - React, Tailwind, and code Playground

HTML

<button class="rightbtn" type="button" id="startClock">Start</button>
<button class="rightbtn" type="button" id="submitamt">Submit</button>

CSS

#submitamt
{
display:none !important;    
}

JavaScript

$(document).ready(function () {
    $("#startClock").click(function () {
            $("#startClock").fadeOut(function(){
                               $("#submitamt").fadeIn().delay(10000).fadeOut(function(){
                       $("#startClock").fadeIn();
              });
            })

        });
});