Live Increase font-size in home page using Vue 3 and tailwind 3

I need a action for a button to increase and decrease the font-size for all text's in my home page, check the code:

https://github.com/hermesalvesbr/increase-font-size

This font increase button is for the visually impaired.

I need it to be done in the project above that I sent on github in an easy way, in which I can replicate in the sub-pages