Realign menu arrow with button + eliminate overlap between them

@terrylucas @dinhviethoa

Combining fixes provided by @terrylucas and mine to fix the menu styling (hopefully for good now).

![screenshot from 2014-01-17 16 17 56](https://f.cloud.github.com/assets/5606182/1945717/0cccb838-7fd6-11e3-8ddf-3592a9038896.png)