lassList.toggle( 'muted', this.isMuted );
      }

      updateMuteButtonVisibility() {
        if ( this.mode === 'stopwatch' ) {
          this.muteBtn.style.display = 'none';
        } else {
          this.muteBtn.style.display = 'flex';
        }
      }



      makeEditable() {
        if ( this.mode === 'stopwatch' ) {
          return;
        }

        this.wasRunningBeforeEdit = this.isRunning;

        if ( this.isRunning ) {
          this.pauseTimer();
        }

        this.display.removeAt