www.wysiwygwebbuilder.com

Hello again.

I have a client for whom I need to set up a website with "accessibility controls", like the one in the link below (see on the top controls for zooming in / out, contrast, gray scale ...):

https://www.moderna.com.br/pagina-inicial.htm

Is there any such extension for this?
Or any solution that does not depend on programming?

I do not have a standard solution for this. To implement this functionality, you will need a third party script.