const hours = document.querySelector("#hours");

const minutes = document.querySelector("#minutes");

const seconds = document.querySelector("#seconds");

let startingTime = 10;

let time = startingTime * 60;

let interval = setInterval(startTimer, 10);

function startTimer() {

if (time === 0) {

clearInterval(interval);

alert("The countdown has finished!!!");

}

let hoursTime = Math.floor(time / (60 * 60));

let minutesTime = Math.floor(time / 60);

let secondsTime = time % 60;

secondsTime = secondsTime < 10 ? "0" + secondsTime : secondsTime;

minutesTime = minutesTime < 10 ? "0" + minutesTime : minutesTime;

hoursTime = hoursTime < 10 ? "0" + hoursTime : hoursTime;

hours.innerHTML = `${hoursTime}:`;

minutes.innerHTML = `${minutesTime}:`;

seconds.innerHTML = `${secondsTime}`;

time--;

}