JSFiddle - React, Tailwind, and code Playground

HTML

<div id="tempo"></div>

CSS

.texto{
  color:blue; font-size:20px;
	position:absolute; 
  right:3em; top:18px;
	}
				   
#tempo{
  width:70px; font-size:50px;
	color:red; font-weight:bold; 
	position:absolute; 
  right:5em; top:18px; 
	padding:5%;
	}

JavaScript

var count = Number();
var count = 60;
var tempo = document.getElementById("tempo");

function start(){
	if ((count - 1) >= 0){
		count -= 1;
		if (count == 0) {
    count = "<div   class='texto'>Atualizado</div>";
		}else if(count < 10){
			count = "0"+count;
		}
		tempo.innerHTML=count;
		setTimeout(start, 100);
	}
}

start();