Correction to above:
In fact, when I narrow the width of the page on the Desktop computer the Globe stays the same size, unlike what happens in your demonstration!
I believe I copied your code faithfully, and changed the location of the image. The only thing that I ended up not doing was adding the 640x400 at the end of the img src as it did not work.
I've also deleted the overflow:hidden; so that my extra destinations show below the globe.