Demo is coded with CSS3 Recommendation syntax. You can select compatibility level to see how your browser performs to standards:
Clock size was designed as 100em, so it can be scaled down by altering container's font size. You can choose one of following clock sizes to check and see more bugs (:
Links:
Source on Github
Demonstration at codepen.io Demonstration at cssdeck.com
©2013 Nik Rassadin CC BY-NC-SA 3.0