Member Sign Up block formatting

Hello,

For some reason, my chosen template is displaying the member's area fee in a rather mammoth font size (and is also including a decimal for cents, which is unnecessary). There is no option in the block to change font sizes or formatting. And making changes in Site Styles (fonts) doesn't seem to have any effect on the block fonts.

So I assume I'll need to use the CSS Editor. What would the CSS property name be for the Fee font? Is JavaScript required to hide the decimal and cents? Thanks,

Michael