Ctrl+Shift+P → Package Control: Add Repository → https://github.com/i-akhmadullin/Sublime-CSS3
Ctrl+Shift+P → Package Control: Install Package → Sublime-CSS3
(in .css file) View → Syntax → Open all with current extension as... → CSS3
原文：http://blog.csdn.net/u011763190/article/details/44875019