What an amazing collection of quotes!
In addition to learning new programming skills as I work on this exercise, I am deeply touched by the all time wisdoms packed in these quotes.
I salute the person who put them together!

Manual forward and back buttons are created along with event listeners to make them fully functional.
I have also made a few improvements to the quote generator and the alarm clock.

Stop and autoplay buttons have been added to complete the second part of the challenge.

I've added a toggle switch styled checkbox slider to auto-generate quotes when it is on.

I have replaced back and forward buttons with arrows and the remaining three buttons as well are now appear less crowded and more  styled and centered.

The switch button's position is now in a better alignment with the original manual button. I had to just add a bottom margin to make that happen.
Comments have also been added for the readablity of the code.