We cover the use of CSS margins vs padding, the box model, bleeding and collapsing margins, and concludes with some cool layout tricks.
Spacing on the web (padding, margin, and Occam's square) — web
Bootstrap Spacing Spacing in Bootstrap - Scaler Topics
How to Set CSS Margins and Padding, and Cool Layout Tricks
Padding vs Margin: What's the Difference in CSS?
How do negative margins in CSS work and why is (margin-top:-5
A Utility Function for Padding Strings and Numbers — SitePoint
Email Spacing: Tips for Margins and HTML Email Padding
如何设置CSS 的外边距和内填充(附布局小技巧) - 知乎
Everything You Need To Know About CSS Margins — Smashing Magazine