Need help with jQuery pomodoro clock countdown

Hey guys, I am currently working on the Pomodoro Clock for Front End Libraries. I’ve created a function called countDown to decrement the timer but seems to not work. I used a setInterval function to perform the countDown function every second after the start button is pressed. Any help would be appreciated. Thanks!

My Code Pen

I figured it out it was just my updateTimer function was not working with the countDown function.