So glad someone asked this! I won't bore you with too much detail, but we're essentially wrapping the outer website into the actual app itself.

The reason the main part of the app loads so quickly once you click the button, is because it's already loaded before you even hover on it. That drawing you see in the background when the page loads is an actual drawing being performed on the app's real canvas :)

Backend: Clojure & Datomic

Frontend: Om/React & LESS