Default Zoom for my website

Hi Experts,

Building my website and thoroughly enjoying this. Could you please provide tips on how I can set the default zoom to 80% for my website for any of the browsers. My site renders just like I would want it to at 80% zoom and I do not want anyone increasing-decreasing the zoom and want it to be fixed at 80%. Any tips or tricks please?

I googled for answers and they ranged from using css to some other alternatives etc, I tried them but did not work. Maybe I am not doing it right so exact steps are very much appreciated.

Thanks in advance,

- Jay