It's done via the 'z-index' CSS property [0]. Essentially, the higher the z-index, the higher the priority of the element; a higher z-index will appear in front of a lower z-index.
If you're building isomorphic code for the browser using webpack, you can quite happily chunk certain modules into separate bundles which will be loaded asynchronously when needed. It's pretty awesome.
Thank you for feedback!
We are working to improve user experience all over the app and soon we'll come up with a more neat starting/login page. Now, it's just for beta testers. So, thank you for joining us!
Adding friends will be also reshaped in the next version and FB integration added. But, nevertheless try to add some friends and use meetup to set a meeting with them in a precise location.
We do have a way to go in terms of optimising the site, but we are currently only open to a small number of alpha users. I can safely say that by the time we open the floodgates to the general public, these issues will have been addressed.
I also find that being strong(er) is more useful in my daily life than increased aerobic capability i.e. picking my nine year old daughter up and carrying her on my shoulders, moving heavy stuff in the garden etc.
[0]: https://developer.mozilla.org/en/docs/Web/CSS/z-index