In Internet Explorer menu we have View\Text size\ then 5 option: Largest, Larger, Medium, Smaller, Smallest.

Problem: when we changing with the above 5 option, normally font size in the web page will change. But this not happen with XOOPS site (when we change with the above five option, the font size keep the same)

My question is: How to make my XOOPS site (ria1.org) change the font site automatically when I am changing between the five options: Largest, Larger, Medium, Smaller, Smallest

Thanks a lot