Responsive FAQ with Accordion style

I wanted to ask about the style-guide in this challenge. It tells the font size to be 12px But after I tried to implemented in the design, the font just looks totally small, which make me wonder about the size of other elements which already I made. Is the design font I created next should follow the style-guide, or is there any way to make that not looks small even though I follow the exact style-guide? Thanks,