Hello world. This is 16 pixels. Looks fine to me. This looks to big to many web designers for a base font size.
This is 14 pixels. We've now changed the base font of this page to 14 pixels by setting the font size to 62.5% on the body, thus making our 16 pixels 14 pixels.
The problem with this technique is the cascade / inheritance / compounding issue hence nested elements need to have thier size either calculated requiring tricky maths, or declared
A paragraph within a list item.