Remove element from selectors in example

This is such a small example, so the additional clarity is not
technically needed. Plus, this is generally bad form and is a shame to
include bad form in example code.
Namespace selectors in example

The selectors that were there were pretty generically named and in a
real-life scenario could easily cause a collision. I am improving the
example by making these class names more specific, and clearer as to
their purpose.