Making HTML page zoom by default

Question

I designed a page where buttons look good when the browser zoom is at 90%, but other users view it at 100/125%+ by default, resulting in button and input form overlap.

So, when my JSP page loads, I want to set the zoom value to 90% by default.

How do I go about doing this? Can I make the page non-zoomable after making such a setting? Is there a better way to solve this?