​

const buttonEl = document.querySelector('#toggleCounter')

const countdownEl = document.querySelector('[data-mdb-countdown]')

const countdown = Countdown.getInstance(countdownEl)

let isRunning = true;

buttonEl.addEventListener('click', () => {

  if(isRunning) {

    countdown.stop()

    isRunning = false

  } else {

    countdown.start()

    isRunning = true

  }

})