timer.js

// create the interval that creates the timer
function createTimer() {
  interval = setInterval(() => {

        // 1. increment our count
    count++;

    // 2. calculate the offset and apply it
    const offset = height * count;

        // 3. apply the offset using css transforms
    numbersArea.style.transform = `translateY(-${offset}px)`

    // 4. stop the interval at 10
    if (count >= 10) {
      // go to the next episode
      clearInterval(interval);
    }
  }, 1000);
}