I know some very basic CSS. The customization notes say:
Define custom styles for large print by assigning them in the body class .fontsize in your theme stylesheet.
Can you give me a purely hypothetical example of what a rule might look like that could do this? Might it be something like putting #body.fontsize {font-size: 26px;} somewhere in my style.css file? I understand that you would need a lot more info to be sure it would work, but it would be great to have some simple code to experiment with.