Matt Gemmell's Author Marks in CSS3

Matt Gemmell released a script to help author's unobtrusively mark what they felt to be their main points. Not one person said, "can't this be done in pure HTML & CSS?", yet I slapped together a solution anyway.

I've embedded an example below, or if you're into Codepen (like the cool kids), then head over there and do me one better.

Comments?

Nope. Don't worry about leaving them here, instead hit me up @TRST_Blog and share your thoughts.