Crowdfunding Page - Mobile First, Sass, JS, modal & input

I tried to support assistive technologies♿ as much as possible.

• All interactive elements can be accessible by keyboard focus.
• I tried to tackle "keyboard trap" to avoid focusing elements on original page when opening the modals, however I could not achieve by solution. Could someone give me a good advice on it? 🙏

Here is the functions of this website;

• Bookmark button should be toggle.
• The target value, backers and the progress bar should be updated upon every donation.
• Select Reward button and Continue button should be disabled when amount left gets 0. - I still have an issue on changing the container to get lower opacity.
• Amounts left on main page and modal should be updated upon each donation.
• By pressing Escape key, modal should be closed.
• By clicking modal's overlay, modal should be closed.

I am now focusing on WAI-ARIA and the coding on JavaScript. Any suggestions and feedbacks are welcome!