text: var intervalVariable = undefined;
  var timeleft = 0;
  var totaltime = 0;
  function startTimer() {
  
  
      intervalVariable = setInterval(
          updateTime
          , 10
      );
  }
  
  function resetTimer() {
      stopTimer();
      timeleft = -10;
      updateTime();
  }
  function stopTimer() { 
      clearInterval(intervalVariable);
  
  }
  
  function updateTime() {
      timeleft = timeleft + 10;
  
      let timers = document.getElementById("timers");
      let timerms = document.getElementById("timerms");
      let milli = timeleft % 1000;
  
      timers.innerHTML = Math.floor(timeleft / 1000);
  
      timerms.innerHTML = Math.floor(milli / 10);
  
  
      timers.style.color = "green";
      timerms.style.color = "red";
  
  
  
  }