discourse/discourse — pull request #3044 by awesomerobot (2014-12-16 03:19:18+00:00)
Title: changing font sizes to ems, so fonts scale a bit more gracefully

as discussed here: https://meta.discourse.org/t/increasing-the-font-size/19346

now if a font size is set it will scale all children relative to the parent container - so:

html {font-size: 20px} //scales all fonts

.posts {font-size: 20px} //scales only fonts within .posts