Typography is an important part of web design nowadays and free services like Google Web Fonts or Adobe’s Typekit make custom fonts on the web a commodity.

Let’s take it slow and start with a core principle of typography, vertical rhythm. Vertical rhythm is about spacing body text or, more generally, vertical stacked elements, in a consistent manner to give structure and hierarchy to your content.

Some use the body text’s line-height as the measuring unit for the vertical rhythm. But using half of this value is a better choice because it can give you more reliability on automatic calculation of line-height for different font sizes using mixins.