Nice job. No doubt css is getting better and better with every new release and same goes for browsers.
Waiting for the day when all the browsers will become completely unified and one don't have to worry about cross-browser compatibility.
I don't know if there is a way for the person next to the person wearing a glass to tell whether the glass is on or off, but if there is no way then there has to be one which will take care of the security issues like recording a video, taking a picture etc while talking to a person and that person don't know about the same.
Many people involve themselves in weight training and cardio exercises because of which they miss out on ground exercises. I am sure this app will help them a lot.