this.updateMuteButtonVisibility();
      }

      initializeElements() {
        this.display = document.querySelector( '.timer-display' );
        this.playPauseBtn = document.querySelector( '.play-pause-btn' );
        this.resetBtn = document.querySelector( '.reset-btn' );
        this.muteBtn = document.querySelector( '.mute-btn' );
        this.minutesInput = document.getElementById( 'minutes' );
        this.secondsInput = document.getElementById( 'seconds' );
        this.progressRing = document.quer