Resolve JavaScript Console Errors Post-Update

I've recently encountered some console errors after incorporating new custom JavaScript code into my project.

Key Tasks:
- Diagnose the cause of the console errors primarily linked to the new custom JavaScript code.
- Rectify any JavaScript conflicts with jQuery to restore proper UI functionality and ensure all functions execute as intended.
- Ensure the code is efficient and does not cause further conflicts or errors in the future.

Ideal Skills:
- Proficient in JavaScript and jQuery.
- Experience in debugging console errors.
- Strong understanding of UI/UX-related JavaScript functions.
- Capable of ensuring seamless integration of custom code and pre-existing scripts.

See attached for the code. Above you need to load jQuery. The bottom block of code is what's causing issues:

// Color Toggle

Thanks