Fixing height glitch.

Hi!
So, when hovering the home page items under "Campanhas recentes", some rows get messed up.
Is anyone else experiencing this?
![selection_007](https://f.cloud.github.com/assets/461771/1012469/900dbfe2-0b70-11e3-9344-f972be938558.png)

The height of the hidden "Pressionar" button is what's causing this unexpected behavior: there's a one pixel difference. I fixed the glitch by making the parent element min-height: 28px (the height of the button).
Great work, btw!
Felipe.