What you can do is, you can scale your webpage's <html> (area covered by html tag) by using
scale property available in CSS.
Using
scale property you can scale any element in webpage by any size.
For example,
<div id ="t_div"></div>
Now we can scale the size of the division as follow:
#t_div
{
-moz-transform:scale(1.5,1.5);
}
Above code will increase the size of division by x1.5 . Same way we can scale height width of <html> tag.
I have shown the solution using jQuery to apply scaling dynamically, according to user's resolution at this:
How to Fix/Solve the Website Screen Resolution Problem?.