Love this whole website, there is just a complete flow to it. Each page transitions well to the next, and the whole website is clearly linked. The circles break the website up a little and create great contrast.
Capture critical CSS above the fold with one click. Works for most websites, this extension captures of the of the currently active media query CSS. Selectors like pseudo-elements don't get captured (yet), so in some cases minor tweaking is nessescary.