I have been spinning my wheels here as I am still learning websites. I have custom code (which you may use) to add a free accessibility bar to your website.
I am having a hard time linking all the code needed.
Here are some links for you:
Example (Demo) site:
The instructions I am using.
My public Github: GitHub - TheMarketingGuru/Accessibility: Accessibility plugin repo
asb.js:88 Uncaught TypeError: Cannot read property ‘insertBefore’ of null
(link to specific code error: https://combinatronics.com/TheMarketingGuru/Accessibility/main/Accessibility-Settings-Bar-master/src/js/asb.js)