Check out a free preview of the full Responsive HTML Email Design course:
The "CSS In Emails" Lesson is part of the full, Responsive HTML Email Design course featured in this preview video. Here's what you'd learn in this lesson:
On the web, styles live either in an external style sheet or within a <style> block. In emails, however, inline styles are the safest and most supported way to style elements. For consistency, Justine recommends only styling the <table>, <a>, <img>, and <span> elements. She also talks al little about CSS resets.