Proporse info box - text unreadable. #281

It seems fixed by tuning CSS color values.

I am not really confident in my CSS knowledge and taste in colors, but it is more readable with the fix.

![iss281_popup_text](https://cloud.githubusercontent.com/assets/1835678/4430409/db743de6-462d-11e4-852e-875052f75eec.png)