Strangely, it doesn't have geolocation which seems like it would be a super easy win. I bet they have a good reason though.
I think it's a good example of super simple effective design. I could point out about 5 or more nitpicky little design flaws, but that'd just be dickish considering how easy to use it is.
I'm mostly posting it because of "This store is currently open!" which I've been saying websites should be doing forever.
*May or may not contain any actual "CSS" or "Tricks".