Paragraph font-size across devices?

Hey guys, I just started using GP and I am wondering if there is a way to change the font size of paragraphs across devices. I am sure it is there, but I haven't been able to figure it out yet. I know it is easily done within the headline tool, but what about in the regular paragraph block? Is it possible to have a larger font on the paragraph text on desktop and a smaller size on mobile without coding? If not, can you please point me in the right direction to code it in? Thanks in advance!