password generator app

What challenges did you encounter, and how did you overcome them?

I had various issues on customizing the input range bar and its thumb. I overcame by consulting on google and AIs. I still have not been able to control the thumb programmatically, as its location may misalign when the page is refreshed.

I generated a password simply by choosing characters randomly from the pool. There is no guarantee that it does include a number when the 'Include Numbers' check box is checked. What is does is simply to add 0-9 into the pool of characters.

What specific areas of your project would you like help with?

I would like to know how to move the thumb of a range input programmatically, so that I could fix the misalignment issue mentioned above.

In addition, any suggestions on html/css/script for improvement are appreciated!