What colors can I change in the Accessibility App for Magento Extensions?

Go to Stores → Configuration → AppifyCommerce → Accessibility Toolkit and expand the Colors section. You can set six colours: Background Color (the widget panel and icon), Highlight Links, Read Focus, Icons and Texts, Highlight Headers and Tooltip. Pick colours that align with your store's theme, click Save Config, then flush the cache.

You can install Accessibility App from here.