The size of the radio buttons can be determined by setting the height and width properties on a CSS rule.
Example
Does this demonstrate the idea of setting the size of the Radio buttons?
Yes
Maybe
No
The size of the button is also affected by adding a "font-size" rule.
This is the same size as the medium button above with "Font-size : 3em" added
The idea can be applied to other elements as well, for example a checkbox:
These bits will look normal in explorer, try them in Mozilla/netscape.