Icon size change

Great design, just what I was looking for and now purchased. I was looking for a few options regarding making a few changes to some of the details.

Could you please direct me to the CSS code that can change the size of the icons, to make them slightly bigger. I’ve my own icons that I’d like to use but the detail is being lost with the small sizes.

Also…

Can you direct me the CSS that would allow me to add a transparent white background to the test on the pages as its difficult to read in some cases.

Thanks